Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d8c0ccf09d1b3f…

MALICIOUS

PDF

81.2 KB Created: 2021-06-08 11:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8df5341d9d3eec999ab61b84d4cfcbe8 SHA-1: 429b735f995f7c18f5d126f0d4862d77822f7dfb SHA-256: a6d8c0ccf09d1b3f3ebd70459d600ca2db3460dfb748ff8337b5e89f47025c4e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials T1059.007 JavaScript

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials by requesting MFA confirmation. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious phishing intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://baarspo.ru/123?utm_term=latest+telegram+desktop PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417805/normal_5fff5cb723ccb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5fe1c72c7c2ff.pdfIn PDF document text
    • https://puxibaso.weebly.com/uploads/1/3/0/9/130968956/623271.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/39735f787.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373239/normal_5feefcd516176.pdfIn PDF document text
    • https://muwivagejexe.weebly.com/uploads/1/3/1/3/131379070/morida-zadowuzotuju-dozubeza-mujuruvepegimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413120/normal_60643c952ad20.pdfIn PDF document text
    • https://zisaneviz.weebly.com/uploads/1/3/4/3/134319132/dc71577d2.pdfIn PDF document text
    • https://rimokukesezawuk.weebly.com/uploads/1/3/1/4/131437069/wafofowatiza_xagupon_fapexipa.pdfIn PDF document text
    • https://sofugiri.weebly.com/uploads/1/3/4/5/134509821/4599350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446027/normal_5fcc9c271da12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495246/normal_5fc5e77be41eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5fdabdc6b9a33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ludagobef.pbworks.com/f/free_gay_chat_line_numbers_in_houston.pdfIn PDF document text
    • http://bekojifutok.pbworks.com/f/ethical_egoism_mean.pdfIn PDF document text
    • http://dumajimov.pbworks.com/w/file/fetch/144771822/kiraxekodipivunizosapojav.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/f/60066791209.pdfIn PDF document text
    • http://garifukedako.pbworks.com/f/pumafetageruxoruvivetowir.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144426810/adding_and_subtracting_decimals_word_problems_worksheets_6th_grade.pdfIn PDF document text
    • http://padimagofo.pbworks.com/f/piwukekaxopijixuku.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144421221/63138483214.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/f/is_granular_chlorine_better_than_liquid.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 4916 bytes
SHA-256: 38e376edf81b5e04379714377b90ecf0be72713b3ddd70a13e3f4fde1218853c
font_01_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 10496 bytes
SHA-256: abe7f641d03dc31bcb878d64fe93f4526caca3d0b08599c98fb11a6d3bdbd84b
font_02_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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