Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0b1fc78e12e172…

MALICIOUS

PDF

68.5 KB Created: 2021-01-18 16:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 439b43be7b6e4de4da7b3f653a1e57d9 SHA-1: d14618bbb819ec3cbfead1a21000f9ff3ec12f79 SHA-256: 3c0b1fc78e12e172a806e21bdd592d0c4358255fa0a26a08d3bfa8f1fce794c1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea that it's a lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?utm_term=carta+poder+simple+pdf
    • http://babarogumo.iblogger.org/vuzabexosenomuwovadofu.pdf
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/latisipifa.pdf
    • https://wekonopu.weebly.com/uploads/1/3/4/8/134848362/6867628.pdf
    • https://mivodijabid.weebly.com/uploads/1/3/4/7/134732330/1713629.pdf
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/paxulodatonu-xerumojowibuwo-fasanijalivopak-domudefixafija.pdf
    • https://xuzufudoroxibu.weebly.com/uploads/1/3/4/7/134755415/jegit.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/gosibokuvefuj.pdf
    • https://site-1258042.mozfiles.com/files/1258042/godixufurefuxu.pdf
    • https://veborikaja.weebly.com/uploads/1/3/4/3/134317734/3347907.pdf
    • https://mudukexot.weebly.com/uploads/1/3/4/6/134629884/1505011.pdf
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/5ef7f48.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sabukizazuse.epizy.com/far_cry_2_weapons_guide.pdf
    • http://vobogiv.rf.gd/bucket_list_full_movie.pdf
    • http://fufibilola.epizy.com/kosagalopemifenanilinal.pdf
    • http://bususetut.epizy.com/va_dmv_driving_test_study_guide.pdf
    • http://duvexarido.epizy.com/inventors_and_inventions_list.pdf
    • http://xupudajiwozov.epizy.com/definition_of_computer_science.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_off0000d015.bin
a67a62298947e53cf2ff6d38014369037e28fa943ca3de1043caa1bb0a706fc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD015 5092 bytes
font_01_sfnt_off0000e14e.bin
63ee415133458348a9814f40cb610fa304526b71fb80884faa8ed44a5609254e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 11044 bytes

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