Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f565283380b04e…

MALICIOUS

PDF

112.5 KB Created: 2021-03-12 04:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f952f928cbfb6a14f08eada13576a7c7 SHA-1: b32fc80cad6513374516ad76a63d50d1b195303d SHA-256: a8f565283380b04ef2cc17e1a2ac8e5ea5da6b19cf32e340d90b4e6ff1b2a601
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/award?keyword=anamnesis+fisioterapia+pdf PDF link annotation
    • https://cdn.sqhk.co/zalenemu/wiiifKG/gowop.pdfIn PDF document text
    • http://punazopepaxum.iblogger.org/isometric_drawing_exercises_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/hfMwzjc/asphalt_6_mod_apk_revdl.pdfIn PDF document text
    • http://bolipoloweda.mygamesonline.org/13210008901.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://renureva.epizy.com/1809414765.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_8dc1e8794f924c65b186a83a198201f4.pdf?index=trueIn PDF document text
    • http://joluror.rf.gd/42152710007.pdfIn PDF document text
    • http://somujewod.rf.gd/briggs_and_stratton_190cc_lawn_mower_oil_change.pdfIn PDF document text
    • http://resimibesogew.rf.gd/vekagapizeraterizusat.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_795cca1c1eed44918454d85f3073097d.pdf?index=trueIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_d6041ddaf43344f88026c7f57b06deda.pdf?index=trueIn PDF document text
    • https://f17d7c47-ad5c-48a5-8dbe-4a5f5c0db24a.filesusr.com/ugd/9b2d9b_8299a9a81ce7469eb08dbfbb39ea24f8.pdf?index=trueIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/45636687994.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_3186a50d1a5c49539086e934ab0ff537.pdf?index=trueIn PDF document text
    • http://xelidamos.epizy.com/avidemux_software_for_pc.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_a03d928366f440a09ed34b85a4ce177e.pdf?index=trueIn PDF document text
    • http://zunebafovako.epizy.com/bali_road_map.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_a5ece0c03b9b4a259bccdb78a718f6d8.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_dd5aa665b2544ddc828aacac7c305f84.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_148be434742e40a189fcd127ab7e53c1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A00 5144 bytes
SHA-256: 8da4fb796adf3efb869e6fd52f9fda8b7711e763d48bec00be86cd5548df0c91
font_01_sfnt_off00016b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B68 3048 bytes
SHA-256: 8ec2120a8f1db6e419204523afd89e20eeb563c18f0b1a1e5f1f99276c703123
font_02_sfnt_off00017827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17827 10500 bytes
SHA-256: 1af5da7a5a34bdd7be4a52573f24878fdf702cb48bf3bfe9bf8ce06056b62b06
font_03_sfnt_off00019c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C46 17024 bytes
SHA-256: 5b907f54ceb7630e725eab5a24b2a2036157b0fda5d036993d3e91f0759dcade