Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71a4f0a75721947…

MALICIOUS

PDF

72.5 KB Created: 2021-02-21 04:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0c12191acee7190f52f3ffde8c731135 SHA-1: 66e104a5b00f09e391c21ba3491aaf1ed6de4969 SHA-256: c71a4f0a75721947ed585c6b1f23aff1c5bfd4c9dbbe0372c591a627eccecc0e
264 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified links to known malicious redirector infrastructure. Another heuristic flagged the document as a callback phishing lure, suggesting a social engineering pretext. The ML classifier strongly indicated maliciousness, and ClamAV detected it as Pdf.Phishing.Trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=stahls+hotronix+heat+press+stx20 In PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/6fc89c474dea13c.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/jjgcxhi/money_buster_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/baxalelizop/iehgCok/abandoned_mine_escape_room_walkthrough.pdfIn PDF document text
    • http://daating19.site/sago_mini_ocean_swimmer_freet0b8b.pdfIn PDF document text
    • http://redirunna.xyz/41426191923f3plu.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/IgfXhcG/nalovawufolosati.pdfIn PDF document text
    • http://choosenews.space/34141765041ejlp4.pdfIn PDF document text
    • http://xitnet.fun/goxijipedasukapogodafjwqs.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/5985075.pdfIn PDF document text
    • http://ingmijn.com/weekly_ads_and_salesyak6m.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/gjLghaP/6065495125.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/hiFgdhd/32724714426.pdfIn PDF document text
    • https://dufebekeromodi.weebly.com/uploads/1/3/0/7/130776386/1917577.pdfIn PDF document text
    • http://efarbok.xyz/history_of_western_classical_musicxtscl.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/pisedij/confluence_create_template_api.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/cue_sheet_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/21188904276.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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 5352 bytes
SHA-256: a366a85c94435d896acff6915dc7b2b035a989b411e314900088d6a86dc7962f
font_01_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 11600 bytes
SHA-256: 44f94bef240a17de3b5935041d11b00afef9053f29d8ece3be1f1770dec77692

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