Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea42820d7b00493…

MALICIOUS

PDF

89.6 KB Created: 2021-03-13 17:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70b770061a5310ddd3fc75dcdc99b5a5 SHA-1: b911975fe15d5591078447144358e9a9872d5f55 SHA-256: 6ea42820d7b004936b39c75ebe311c4a7d90512a100d7b958db89f3001326210
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to a link farm designed to redirect users to other sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, suggesting a lure to generate traffic to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/award?keyword=igualdad+de+genero+definicion+pdf
    • http://options.expert/66973590629uz7zl.pdf
    • https://metesanej.weebly.com/uploads/1/3/1/8/131858044/7cc0e.pdf
    • https://tovibibuxajewen.weebly.com/uploads/1/3/5/9/135968099/4205993.pdf
    • https://cdn.sqhk.co/fegozanodedu/hbYKaZ3/59321678620.pdf
    • https://cdn.sqhk.co/noneniwetav/jqCN5ib/tilipo.pdf
    • https://cdn.sqhk.co/mifigatira/qjaqhdN/wepusufisuzogufusekaxet.pdf
    • http://rasprodavaika.ru/how_much_can_a_warhorse_carry_5ec37xl.pdf
    • https://nusemidokiz.weebly.com/uploads/1/3/5/3/135395372/6b6923d2b9336.pdf
    • https://cdn.sqhk.co/kitujesijak/hjegjgg/east_front_video_game.pdf
    • https://pimuvetu.weebly.com/uploads/1/3/4/6/134635596/nanema.pdf
    • https://cdn.sqhk.co/kuniremolu/1hjhbgS/63183991865.pdf
    • https://cdn.sqhk.co/mikakiraw/geHiejh/compressed_mask_paper_sheet.pdf
    • http://anyita.space/minecraft_pc_free_1._126m9xz.pdf
    • http://raisinshq.pro/revikiwuxaperejurapobefe8e696.pdf
    • http://testersairf.xyz/regional_anesthesia_books_freeebn7x.pdf
    • https://cdn.sqhk.co/tumowara/RjbD4ib/91600003743.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lofese/human_alimentary_canal_diagram.pdf
    • https://s3.amazonaws.com/zukogi/bosonizazotufewik.pdf
    • https://s3.amazonaws.com/pafiganovavi/jikugipuxamox.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_off00011cda.bin
beacabacb815941e1e8adce0b0d93c45dadcb20d142627e4c6bc36bedf2cc2b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 5084 bytes
font_01_sfnt_off00012e3b.bin
2ae6673abb986ae602b94025e7d684f74f1b926faedc297f8a3a7e8d1323a34d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3B 12872 bytes