Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f3e2873ab50284…

MALICIOUS

PDF

77.0 KB Created: 2021-05-07 03:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0ebb4e28706217519f00027d9fff3417 SHA-1: dcdf74e663026c527f4c26e15d3646f3d7772c37 SHA-256: a3f3e2873ab502840173b03ddd8b607162cdb66d4feb184638e60888180f1837
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=the+importance+of+being+earnest+movie+2002+youtube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449622/normal_602c8210b8094.pdfIn PDF document text
    • https://posonapajisosi.weebly.com/uploads/1/3/4/1/134108616/6243161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_606068322fbb3.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/jibenagitux_botikebejep.pdfIn PDF document text
    • https://pupaxutakigi.weebly.com/uploads/1/3/4/5/134579126/4438637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473047/normal_60276d17b5308.pdfIn PDF document text
    • http://sakipewo.22web.org/5297304968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/somisilegex/taxaderewokew.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/twin_extra_long_fitted_sheets_only.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/81763926290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3fd647-2be6-46a0-8a44-2d20ec4df2ee/putupofekovisuturibetid.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/jusulifapubogegan.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/how_to_make_a_purple_cow.pdfIn PDF document text
    • http://xajalad.epizy.com/saxon_algebra_1_test.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/72805512682.pdfIn PDF document text
    • http://nagurinetawami.rf.gd/4218354657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514256e5-b6fb-46bd-8088-1190eff89c3b/will_there_be_a_land_of_stories_movie.pdfIn PDF document text
    • http://xugibomexepef.rf.gd/mafugaxiwabatijav.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/14668755639.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 5924 bytes
SHA-256: 391af174491ccfbf00303e589d3eb72f370b082dfafc0a52944d387d4331ae82
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 11444 bytes
SHA-256: cde65354f5749eb9e8ad1075260fe1eee0437fd2a83d0f3d9a5067f8a0d74e42

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