Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8705cc5bf1e1b3a…

MALICIOUS

PDF

87.0 KB Created: 2020-12-17 00:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b23a38f3e869b4a268865a186d46158a SHA-1: eecccd0c38979945676e040d10538ba6fd67f50b SHA-256: f8705cc5bf1e1b3a0308bd5b5b39ce6064cb58a35bafef2a1f813ccdcc11803a
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a phishing lure, specifically impersonating Facebook to steal credentials. It also functions as a link farm, directing users to various disposable domains and redirectors, likely to obscure the final malicious destination. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/sexafefalumulowonusu.pdf.
  • 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://traffset.ru/123?utm_term=discord+spam+bot+free+nitro PDF link annotation
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/sexafefalumulowonusu.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/1838179.pdfIn PDF document text
    • https://dawugagulinejud.weebly.com/uploads/1/3/4/3/134368664/davomugijanavefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5f8cb3f92bdc2.pdfIn PDF document text
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/639f6969f0f.pdfIn PDF document text
    • https://wiwawuvagowe.weebly.com/uploads/1/3/4/4/134496439/2757433.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/bakexapiriji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f458304-bf30-4a75-bb07-3304458be20f/32800658879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b54bf60b-951d-4fcb-b08e-c60c7c26468b/49349247505.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/timozozolomisuvitemasetit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/795cc507-11d9-4355-85f0-3083f1223433/lifojan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d78195-bf12-4885-b51a-1ef2f1b58fbb/64145958350.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_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 5408 bytes
SHA-256: 88d7f38b8afaaf5ff07a4230d3e725da1c9b1d9528fd5229232f65fcc0a2c96a
font_01_sfnt_off0001156d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156D 3516 bytes
SHA-256: 2433aff0a357e28f9f984662db3fe3bd0f1c9819b5b32a917b3c5a0c0933606a
font_02_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 14136 bytes
SHA-256: d8825aedccd67493da11cac7f2ab8bc762654a958eb8c082e0fe84486e260741

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