Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d0df1ade68067a…

MALICIOUS

PDF

83.3 KB Created: 2021-04-08 09:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c358eb5f929984cd834de9478a7282df SHA-1: d74b6b4231c45b7e2348f5112f1d43e94f23553d SHA-256: a6d0df1ade68067ae9d45d4597601fe26861d1c118ba71747dd38b0dd7caf25d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to Weebly-hosted PDF files, suggesting an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/wix?keyword=capitulo+7b+answers
    • https://nenafusorez.weebly.com/uploads/1/3/1/4/131453248/magowezapamuwir.pdf
    • https://cdn.sqhk.co/febowozefu/hiugdjd/gofevalala.pdf
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/fe8ff0a4b.pdf
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/busezenezivuju.pdf
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/6573529.pdf
    • https://foxanebipukete.weebly.com/uploads/1/3/4/3/134309218/vozimederugedinepi.pdf
    • https://kawikesidalebel.weebly.com/uploads/1/3/4/6/134649090/zivotidusa.pdf
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/nililawapa.pdf
    • https://poteluteko.weebly.com/uploads/1/3/1/1/131164474/2266285.pdf
    • https://cdn.sqhk.co/novitovikor/hg7LvEm/fun_endless_race_epic_crazy_fun_run_race.pdf
    • https://gijajagilaz.weebly.com/uploads/1/3/5/3/135313732/vokamite_pubabotivupe.pdf
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/74020.pdf
    • https://pojebozotez.weebly.com/uploads/1/3/2/6/132695867/4325133.pdf
    • https://maraliva.weebly.com/uploads/1/3/2/7/132712127/3549771.pdf
    • https://belavapapase.weebly.com/uploads/1/3/4/4/134444277/kujuki.pdf
    • https://cdn.sqhk.co/duzemata/VhiJGz2/nail_hitting_game.pdf
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/918a4916.pdf
    • https://vanakiti.weebly.com/uploads/1/3/5/3/135323710/gibesigoge.pdf
    • https://nekuferalota.weebly.com/uploads/1/3/1/4/131406939/xojukulawapode.pdf
    • https://cdn.sqhk.co/marelagixe/R1gclnk/bitmap_and_vector_file_formats.pdf
    • https://jegofedakosufe.weebly.com/uploads/1/3/5/3/135320490/5866656.pdf
    • https://funobijego.weebly.com/uploads/1/3/1/6/131636789/kuwiwivekevifu.pdf
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/fawusu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcbf.bin
ac55be9f74790d7c289ce0ff528a1cd7c8f86a981808527b49acf9cee291f38a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 5028 bytes
font_01_sfnt_off00010df8.bin
eb67c673f171a5b723cfb21fb452c9636ad69b4123cf1b2ef32533ee9f1ac353
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 10556 bytes
font_02_sfnt_off000131e0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E0 4324 bytes