Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cab75b14a33b41…

MALICIOUS

PDF

95.3 KB Created: 2021-02-25 04:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 68657791685dd2293a878f3f28790a5f SHA-1: 798190447f962991f24cc214e8f6058e1c4844c5 SHA-256: a3cab75b14a33b415ecaf075a853f6cb6996bc6e94d8f9ff3768b08b67832ae8
206 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The heuristic 'SE_CALLBACK_LURE' indicates a potential callback phishing or tech-support scam pretext, although no specific callback number was extracted. No scripts were extracted from this sample, limiting the analysis of direct malicious execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=what+are+the+instrument+used+in+measuring+weight PDF link annotation
    • https://mivagadak.weebly.com/uploads/1/3/4/5/134599435/98374b1e1be25.pdfIn PDF document text
    • http://siondez.ru/lutofevagutawatusazalqtb4d.pdfIn PDF document text
    • https://noxajigaja.weebly.com/uploads/1/3/4/6/134698193/6028078.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/Ribjaig/57652150050.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/2hbhwZS/9004319584.pdfIn PDF document text
    • https://kutepuwabaluv.weebly.com/uploads/1/3/2/6/132681670/pofube.pdfIn PDF document text
    • https://cdn.sqhk.co/zixagiko/dKjdhfo/petuxipajudorusi.pdfIn PDF document text
    • https://fulopovesaj.weebly.com/uploads/1/3/0/7/130740112/jajiwidegupon.pdfIn PDF document text
    • https://kunepupavebi.weebly.com/uploads/1/3/4/0/134095879/340a5b71a.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/hCwGjAi/airbag_light_reset_cost.pdfIn PDF document text
    • https://bazajiwudimikot.weebly.com/uploads/1/3/4/3/134344454/a86f0797.pdfIn PDF document text
    • https://kowulenube.weebly.com/uploads/1/3/2/7/132740682/8c8e807c036c3.pdfIn PDF document text
    • https://fodukajanewirom.weebly.com/uploads/1/3/5/3/135383911/3769619.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/kasuwevovog/gmail_contacts_to_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/shark_vacuum_lift_away_deluxe_loses_suction.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/faceit_anti_cheat_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_off00013725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13725 5312 bytes
SHA-256: d97c79af17d29b7d8c53463eb9d448c9a24b01c9092873562ebc6838568901b6
font_01_sfnt_off00014921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14921 12080 bytes
SHA-256: 3841f6aec09ca6a953216e72aae0e161cb324237b0d2e58bf61b24b4ca5322ac

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