Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1835b2a9990d903…

MALICIOUS

PDF

97.9 KB Created: 2021-03-16 06:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4a5ae222a239d8c7bbd97f65f4836293 SHA-1: 0e080e528fb6f62433e13c2ade579356066a7bce SHA-256: b1835b2a9990d903c32d85433e6a0826416d5630b7c326f66e796eac7cca0532
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/award?keyword=kerala+hindu+baby+names+malayalam+pdf PDF link annotation
    • http://vurejowug.mypressonline.com/reliability_engineering_singiresu_s._rao.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_8dea9e0016174276913b08dbb28fbc0d.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_9239a2168fba44838995070a8c122a32.pdf?index=trueIn PDF document text
    • http://wiwosotu.myartsonline.com/polk_magnifi_max_soundbar_system_specs.pdfIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_c97b173c7cbe42caa4972394ef005c33.pdf?index=trueIn PDF document text
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_f016ffa3338a4bdca511eb6e0ca55d93.pdf?index=trueIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_3f337f811eb14dedaee031d4e62c4c06.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_f0313ed61ed840a4ab86c50791d75ccb.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_9df470bca95042f1b5788ec125ece28b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wulagisi/the_ones_who_walk_away_from_omelas_book_depository.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_53f2dc232ab64b75bb5efad9de713d28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/catholic_prayer_booklet.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_f0fc0a8df4bb42f78167bbef223fc613.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widiku/skyrim_razor1911_crack.pdfIn PDF document text
    • http://salajire.onlinewebshop.net/bernina_1080_user_manual.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_3dfd1b5116e54c76a7cb2cd955ba0b49.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_3daa064f674f44d9aa37b528f25be68a.pdf?index=trueIn PDF document text
    • http://tivakifuzir.atwebpages.com/74073523888.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/vermiform_appendix_is_a_part_of.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_92dd0020a4c74ab981ed5707f091b675.pdf?index=trueIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_385671584983487bb189eac9374dc010.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_4b478e81095b4881bb2fe169b89a21fd.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_ec6d47e94cc049a2ad34bc11f5dbafa8.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_b82216b533ff426c9c8f8b8f15e18158.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_6f2a8c2fd8c4492a952801f38deae250.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 5492 bytes
SHA-256: e057968d3c12c6f48bd5cb119bdfe0662a7f76278aaa9a93bb50d6c8268a5590
font_01_sfnt_off0001273e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273E 4588 bytes
SHA-256: 47d85a3a7305aff545eff8b289424b175ff34eb3ed13e5d699d8004b061c9dea
font_02_sfnt_off0001388b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388B 10680 bytes
SHA-256: 81a95ba098879b29d0afe22b6e9104b7d2b028385283aa258e93359fcaa89e43
font_03_sfnt_off00015d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D00 8644 bytes
SHA-256: 64727cb6b728ace24a4612a9ed695f04a04f4fdb8f5a3a05bb32a0765de14081