Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83500a335abc871…

MALICIOUS

PDF

80.1 KB Created: 2021-02-19 05:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c3acb2d7d178e69c0605b9f532dc6e85 SHA-1: 1a924c42385de6137034dcd4bfce5645e524ded5 SHA-256: f83500a335abc871d4b5171f0e1b51ff031bfaa5ab9e4b690e78cdbdc6093106
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jacksth.ru/strik?utm_term=how+to+install+hp+8600+printer PDF link annotation
    • https://tovibebifenoge.weebly.com/uploads/1/3/2/6/132695438/dexapasonesamaladus.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/gfnibha/13897133833.pdfIn PDF document text
    • https://mizefubu.weebly.com/uploads/1/3/4/6/134637235/1347440.pdfIn PDF document text
    • https://vimijalubatek.weebly.com/uploads/1/3/4/7/134739875/4ca7dfee4.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/hihajgX/72069089099.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/eDgei24/52711275603.pdfIn PDF document text
    • https://suwisabinupa.weebly.com/uploads/1/3/5/3/135351097/tajaroxezu.pdfIn PDF document text
    • https://medimigo.weebly.com/uploads/1/3/4/8/134864966/jugezovobem-panise-jipedegixowa-nonewaxaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugituxi/fUhiAgi/58130453766.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/d401729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_6025b6e809bea.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/dukupoturo-nuxakuraj.pdfIn PDF document text
    • http://zoziwasikow.22web.org/88331542280.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/ghjftjh/8685888664.pdfIn PDF document text
    • https://misetibu.weebly.com/uploads/1/3/1/4/131438078/gotuzasarivon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muvusibose.rf.gd/91827591675.pdfIn PDF document text
    • http://vekifaxofezawe.epizy.com/antares_autotune_audacity_mac.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_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 5452 bytes
SHA-256: 448d82cd4e5d8fb9025ad659a7c434a2354e64e4f2dae2ee27251109f0ef6c13
font_01_sfnt_off00010f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8A 10532 bytes
SHA-256: 760eeab577cbe3745303182085ca57291541db8f28db7eaabce19bdb3c9c878f

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