Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc39d8f266ef8e62…

MALICIOUS

PDF

78.3 KB Created: 2020-12-26 13:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 963dbb7f3d9f53bb5c6bd338847893e0 SHA-1: 5812e96178588ddcdc46f4a5178b3cf2c3fd3573 SHA-256: bc39d8f266ef8e625a7a11a6e8085b4779942171813e0680086b6370589d0226
222 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, indicating it is part of a link farm designed to manipulate search engine results or lure users to malicious content. The presence of a malicious redirector link further supports this, as it points to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=adorn+serif+font+free In PDF document text
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/ponime.pdfIn PDF document text
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/pidadovukipuj-nakuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/ihejdgc/fighter_jet_simulator_games_online.pdfIn PDF document text
    • https://tofejigijo.weebly.com/uploads/1/3/4/3/134312142/8292903.pdfIn PDF document text
    • https://cdn.sqhk.co/waderapal/gjiggZA/96329679203.pdfIn PDF document text
    • https://cdn.sqhk.co/naketego/jaIPje4/53470776845.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/wewiro/56481073301.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/implosion_never_lose_hope_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/bidijor.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/42985601546.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_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 4648 bytes
SHA-256: 9078060c68030732ed77349c454711492ce75ca164d87d06c3f65ed234d24b54
font_01_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 11112 bytes
SHA-256: ed4517ab9d4c6103475aaa84f0d21ccaf1587758eb05774646ea0d99a71ff1d7

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