Malicious PDF — malware analysis report

Static analysis result for SHA-256 c509aedfd848081d…

MALICIOUS

PDF

68.8 KB Created: 2021-02-15 15:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fa2d8a2c2425ac9af867190f4b196767 SHA-1: 1ed4243ebb06e18a0759c3328d571aac2323619a SHA-256: c509aedfd848081d187c549485a42e9c743bd0ea80e8a459de588deddc623077
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous external links, with a critical heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The embedded URLs suggest an attempt to redirect users to potentially malicious or deceptive content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/wb?keyword=ti-30x%20iis%20how%20to%20find%20standard%20deviation PDF link annotation
    • http://zajowidased.iblogger.org/56831674969.pdfIn PDF document text
    • https://xapovakugad.weebly.com/uploads/1/3/5/3/135393008/4380584.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/iQLicRK/bekidizuzodibinasagofo.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/gcibjcz/how_to_write_cnc_programming.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/5KVVjcw/nusuj.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/ajevA9z/rosusefaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384832/normal_5fe13b4bdcfde.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/bjiPvjO/48039894450.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/g5kRwC8/rosiziju.pdfIn PDF document text
    • https://cdn.sqhk.co/jozazixefuf/iag5ijr/narcos_cartel_wars_sicario_gustavo.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/hejdT1m/wiroxusujetikediv.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/7jfdjcy/90870711020.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/mavixu/punuko.pdfIn PDF document text
    • http://fezefujeziged.epizy.com/22174191244.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/internet_and_intranet_engineering.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_off0000cf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF99 5472 bytes
SHA-256: 80b5d488d635d21dc3cbeae28e2725cc8bf1b72b4fdc17b8afa1e5c44dbec85b
font_01_sfnt_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 10572 bytes
SHA-256: 22dc5ee7a704fe135a974271ee65d12ab8e1f25c8b1b30ed359addd5b3fb5c37

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