Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce14391557da52eb…

MALICIOUS

PDF

73.0 KB Created: 2021-03-01 00:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be9d3b0dbbe11d677cd4fe36472e404e SHA-1: 1526b0ca9b0c95ea4758765d87f7c213528d9bf8 SHA-256: ce14391557da52eb17359c5afff4838713e81df2db7270cba330c1af121296fc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing 26 external links. The ML classifier and ClamAV also identified it as malicious. The document body contains a URL that appears to be part of the link farm, suggesting a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=how+to+connect+roku+3+to+wifi+without+remote
    • http://gabutetidik.22web.org/brighthouse_life_insurance_change_of_ownership_form.pdf
    • https://tureduritisamo.weebly.com/uploads/1/3/4/6/134676104/regivabuxipig-dibeluzujut-gigelebunutex-kokidinefo.pdf
    • http://dufifudusimube.mygamesonline.org/logitech_k400_unifying_receiver_replacement.pdf
    • https://nawitesusamu.weebly.com/uploads/1/3/4/4/134480899/nirurem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jenagubadopi/nemijok.pdf
    • https://s3.amazonaws.com/vabemavuputenif/the_ketogenic_diet_lyle_mcdonald.pdf
    • https://s3.amazonaws.com/tirimofufemukat/arundhati_videos_songs.pdf
    • https://s3.amazonaws.com/bejokazemur/zupanajom.pdf
    • https://s3.amazonaws.com/vatosolikijike/soxefogolozudalulirikepeg.pdf
    • https://s3.amazonaws.com/gogonof/88028202411.pdf
    • https://s3.amazonaws.com/jiwisi/32081408103.pdf
    • https://s3.amazonaws.com/dowavelaxam/nupiseradaruka.pdf
    • https://s3.amazonaws.com/fixararololu/59215232302.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2df.bin
fd815550c393b1537bdc21ec4747d3c85f0581874202f7b8ec013b5c5d6cd40d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 4984 bytes
font_01_sfnt_off0000f3c6.bin
5f42c27f5298c506615f38995140e2864974575897d66576e4d25c93d6c48fd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 10300 bytes

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