Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40e5aeb604137f4…

MALICIOUS

PDF

92.7 KB Created: 2021-02-14 01:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3abd5b4b8ccf6a27e5579fa8d565d739 SHA-1: af1cc501808e141cfe2041860afb1258df6faeb7 SHA-256: a40e5aeb604137f4c718c4f1490ee41d9cc3d47c435fda9113a7fe52e768c9e5
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One such link is to 'https://jacksth.ru/123?utm_term=aera+2020+conference+registration'. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious or deceptive content.

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.
  • 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/123?utm_term=aera+2020+conference+registration PDF link annotation
    • https://waxevinibiwe.weebly.com/uploads/1/3/0/9/130969944/a5ed20a5ba901.pdfIn PDF document text
    • https://cdn.sqhk.co/gumojitoxowu/cQgfJjf/interesting_facts_about_space_race.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/ggsqgi4/word_connect_level_992_answers.pdfIn PDF document text
    • https://linowatudevenur.weebly.com/uploads/1/3/4/5/134599813/6692c56bfb.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/xjcjil0/no_man_s_sky_playstation_vr_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481161/normal_5fe18236b7e87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5fe58a5b7613c.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/uiiSjdV/helicopter_flight_simulator_games_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_6009bfdf3562d.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/satedafadusizo/soxifojisedivewidobene.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/35365469.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/25838811218.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/atman_3335_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/52975827603.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_off00012bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEE 5280 bytes
SHA-256: 0f1c42ee91e53d01ae6516e291bbc8bc0899edcc865ffbd0d8f3353741527903
font_01_sfnt_off00013df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF5 11700 bytes
SHA-256: 1cdb22fe182a43bc534bae83de6e64accb712ef528f32d89d79e6243a3e4a975

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