Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5e776278aac16f…

MALICIOUS

PDF

69.6 KB Created: 2021-01-09 20:35:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bf8fc79f3d246807fed6fa74a9118f3d SHA-1: edaae3c67a92a765d535de84ed6da41ddde9b3e4 SHA-256: 8d5e776278aac16f7083c1496473a999be10cfa818b413a5d93dbe751c848356
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing campaign, specifically impersonating Facebook to lure users into clicking malicious links. The presence of a large number of external links, many of which are likely part of a link farm, further supports this assessment. The ClamAV detection and ML classifier also indicate malicious intent, likely related to credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://zunuduzeguw.weebly.com/uploads/1/3/4/3/134344012/d1bfb6fb66.pdf.
  • 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://trafffe.ru/123?utm_term=unblocked+multiplayer+games+weebly PDF link annotation
    • https://cdn.sqhk.co/remudejifi/eicA1jj/live_streaming_tv_channels_hot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5fe51434aa0e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_5fd838a0c8cee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418987/normal_5fdccc209b1e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473892/normal_5fe2a50ab84ff.pdfIn PDF document text
    • https://zunuduzeguw.weebly.com/uploads/1/3/4/3/134344012/d1bfb6fb66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369328/normal_5fc4fb94e0ec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f8df5f2c4965.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/lewuli/discounted_cash_flow_model_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/lewaruzi.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/cracking_the_coding_interview_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/55329196090.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/lalumubofaxopotu.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/solaris_bus_annual_report.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE95 5780 bytes
SHA-256: d76edfb4dab93116218a6e4559613f7aa3a37b07c2ad492064a767b5855c11c6
font_01_sfnt_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 11884 bytes
SHA-256: a54c0f9f18bfa60ce049c3579db2de0c8001b2eda2f61655d7d999e836399002

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