Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e634c10dc418e86…

MALICIOUS

PDF

124.0 KB Created: 2021-02-18 10:03:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8f20a5056c1cdb772a11cc3873876f9e SHA-1: 6dee398f8e1f867ebb7888b4c36a2440be312df1 SHA-256: 8e634c10dc418e8661aad63d5cdb34bd9dda49f5d297312de82501d1965666f1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF documents, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or hosting malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious document delivery mechanism.

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://seumenha.ru/123?utm_term=davis+vantage+pro2+console+battery PDF link annotation
    • https://kukonite.weebly.com/uploads/1/3/4/6/134611202/34e1b6472.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/jfghjgZ/kendall_and_kylie_swim_pacsun.pdfIn PDF document text
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/1725848.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/eYJgdhb/zunusilazimudosanem.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/bUeo0jd/83505553680.pdfIn PDF document text
    • http://refoxipixob.iblogger.org/wemovudutovewaf.pdfIn PDF document text
    • http://vedibekupuviru.iblogger.org/wejabinavakorekamexa.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/gKgehfD/20052313236.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/R4hf9if/swing_states_list.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/dinigugaxej/burrakatha_movie_video_songs.pdfIn PDF document text
    • http://jenulozamaberur.epizy.com/padomitiwipasas.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/asi_hablo_zaratustra_frases.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/87745162215.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/ikea_cadre_photo_format_a3.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/98382214257.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/applied_and_fundamental_research.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18789 8680 bytes
SHA-256: 7a3df4663c8657b465cc33b541c0d5b664a6ad26f2c40f2666f8c160cde8135a
font_01_sfnt_off0001a481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A481 5532 bytes
SHA-256: e730b63ace7794b44bc130545b824672c83da4b4bf0e7a1d1fb21c94583e44c7
font_02_sfnt_off0001b777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B777 12732 bytes
SHA-256: 27504ccefe32b27460891533b4d01aa2404ad3d3dc0b77ccd410f333a2d219f0

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