Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b63f17254a1250…

MALICIOUS

PDF

75.5 KB Created: 2021-06-10 11:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f06f2fa6abfa4126db744aee765ee4fd SHA-1: 041d602adaa2d2c68535901f72561fccc3d90b17 SHA-256: 76b63f17254a12507dabf967c25f90a90d13049b09f8d0033c04fcf726bd18c8
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

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.
  • 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://synerhu.ru/pbw?utm_term=crisis+on+infinite+earths+pdf PDF link annotation
    • https://pezilesuwubev.weebly.com/uploads/1/3/4/6/134639222/2b430249.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/24b8b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_602cb35e87fc1.pdfIn PDF document text
    • https://wemogejivaje.weebly.com/uploads/1/3/1/0/131070934/kamilaxekuxokexuzo.pdfIn PDF document text
    • https://wilasumoleliwu.weebly.com/uploads/1/3/1/4/131414134/5525f16.pdfIn PDF document text
    • https://neninexi.weebly.com/uploads/1/3/4/7/134714879/jepekibosifirevowopi.pdfIn PDF document text
    • https://xisigonok.weebly.com/uploads/1/3/4/7/134722575/xagizizanab.pdfIn PDF document text
    • https://kunatelifarak.weebly.com/uploads/1/3/2/7/132712072/tupof-midugud-sirezazek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369141/normal_5ff67942cd101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_605977bfd6a56.pdfIn PDF document text
    • https://xamifixi.weebly.com/uploads/1/3/1/8/131871938/8ca757859d20f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufujibumufa.pbworks.com/f/fleischner_society_guidelines_for_pulmonary_nodules.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144652065/57645771894.pdfIn PDF document text
    • http://nonesupul.pbworks.com/f/twintec_water_softener_installation_manual.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144534228/18360885627.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144514641/negawuranawefa.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144485199/gaterumezewotugisokilumom.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144822255/99992488273.pdfIn PDF document text
    • http://dodosuta.pbworks.com/w/file/fetch/145010628/depul.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144738822/44530615901.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_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 5004 bytes
SHA-256: 5be890fed877017fac71b0dc0d692b2f8a219184301e90bf51b08126da2aae7e
font_01_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 11164 bytes
SHA-256: 3b152ef6d29f3e2751ae66417d591034ea993f614998dd88f2b58ba1acdcaa29

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