Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf92041bb2621f6…

MALICIOUS

PDF

79.5 KB Created: 2021-02-02 05:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c54ee9ad124044f39db66858bc091ee9 SHA-1: b83ce254e9686fb5f0583e6a70b5fe11c883dce9 SHA-256: fbf92041bb2621f6be7be9da506fab2fcd48b3ad3a989995de2cb1ce6aa9efbe
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wb?keyword=six%20flags%20over%20ga%20virtual%20reality%20roller%20coaster PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502178/normal_5fe56ea885b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_6018b1fe64395.pdfIn PDF document text
    • https://luwusimoxoxaxa.weebly.com/uploads/1/3/1/4/131453453/rugaxekumuru.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/6719550.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/8129003.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/kedidukop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382405/normal_5fe365f288cf0.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/vagitilojitepa_pipon_xegobutixor.pdfIn PDF document text
    • https://zovuzutozureje.weebly.com/uploads/1/3/0/7/130739602/rinale-vowasogok-koxenumudixas.pdfIn PDF document text
    • https://zinikedefi.weebly.com/uploads/1/3/0/7/130740178/4990273.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387922/normal_5ff9287e2384d.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/BDidqle/spin_the_wheel_numbers_1-_6.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/kggmihL/slither._io_unblocked_games_66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389794/normal_60084f1b0adb5.pdfIn PDF document text
    • https://bixevojug.weebly.com/uploads/1/3/0/7/130739122/fb806350f9ec.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/xuxifuzituwu/binomial_series_proof.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/94918756455.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/moxetejenogeboxesevetinap.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_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 5384 bytes
SHA-256: c09c73eaf924c04abf81e561025cada54d61a38fb065421ee1ab7f67c95a2e49
font_01_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 11124 bytes
SHA-256: ca88532a8924fb5b4075ac88716f20c36ce1f7ada6db52f087f8a5564eb592f9

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