Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36af299d4c6a07f…

MALICIOUS

PDF

88.4 KB Created: 2021-04-09 14:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d44bb70acc04187f97331fca8852a055 SHA-1: 6b2befbb0838c114844dfb67a88e184aa1c5747f SHA-256: e36af299d4c6a07f3b9c07751c649eabe37973700db3347879aa5d278737897f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The primary external URI points to a suspicious domain, likely serving as a distribution point for malware or phishing content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links, coupled with ClamAV and ML detections, strongly indicate malicious intent, possibly involving JavaScript execution for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+repair+air+conditioning+in+car
    • https://pijuvadugodawa.weebly.com/uploads/1/3/4/3/134307721/newekiminepapi-tutaxaw.pdf
    • https://cdn.sqhk.co/tutabalero/YMjbjh5/turbo_stars_mod_apk_rexdl.pdf
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/lulozosos-xefoze.pdf
    • https://cdn.sqhk.co/tumitibira/jjohe9T/angry_birds_2_movie_song.pdf
    • https://loxogekero.weebly.com/uploads/1/3/4/0/134040689/selinubux_bejejajuxupe_folevuboninenif_xofobupoziji.pdf
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/sunevisususebur.pdf
    • https://cdn.sqhk.co/duxadikoti/bYgdbPB/22089417700.pdf
    • https://cdn.sqhk.co/fuwufupi/hfAcfjf/blockman_go_mod_apk_unlimited_gcubes_2020.pdf
    • https://cdn.sqhk.co/dixejetafap/q0jhggs/87087421724.pdf
    • https://fazijexin.weebly.com/uploads/1/3/2/7/132741066/samifekid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a38fc31e-d372-4d01-9408-7a582b8fba7d/sopowo.pdf
    • https://uploads.strikinglycdn.com/files/81a3412d-ef42-4600-9369-375ca03b6c46/war_and_peace_movie_1966_review.pdf
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_fea64ae5f5704438a19d2a3b16ce8028.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f10cf427-8223-474d-aa6a-055cf5f35b0b/71784021619.pdf
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_98334ac789d24dcb8d1464e185c5126c.pdf?index=true
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_6e8406a6ab4d49b3a0c9227ca7240145.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1d031ccb-b2b7-4f11-920d-78a483d2b05d/ronigujus.pdf
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_323b9919a90e42b99be56a14556ae911.pdf?index=true
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_559bcee7158b4b3f989c963c35372d05.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8c3be780-3f71-4356-8e0c-4a97337a466b/standard_of_excellence_book_1_alto_sax_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/e2414eed-c162-49ac-94df-79734d2f7d27/ernie_ball_vp_jr_buffer_mod_diy.pdf
    • https://uploads.strikinglycdn.com/files/a1265835-7327-43b0-affd-d66baaf5ad46/interior_design_application_for_pc.pdf
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_6ea10eec81094a96ba3ca3d32f20f53e.pdf?index=true
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_0633858464a449b1b0e7a1ae262d20f3.pdf?index=true
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_042b7a2b28ce4efbaf06a4e464557a90.pdf?index=true
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_6da1a0af738c479dafe644cf418e22f3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001106b.bin
87f52cc8cfa43619a852f25bbed6d3025e364da75ca8394d6b840db6362a297d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 4872 bytes
font_01_sfnt_off0001210f.bin
ca7d7e6fa41b5262f16cc93b1391bcc7dc60ae88cab8d492d39eae3b38ba6396
pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 10712 bytes
font_02_sfnt_off00014573.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14573 4324 bytes