Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b3a4d6281f4ab6…

MALICIOUS

PDF

68.1 KB Created: 2021-01-10 00:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a13225e7b40754c2393836864dabfa6 SHA-1: 7d5d87cbc630abf351d3fad4299f991054b4c397 SHA-256: c5b3a4d6281f4ab60b71ea1e34c2887525a32dd8b88598c463cf093a62e67377
126 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as Pdf.Phishing.Trojan. The document body, though partially garbled, suggests a lure related to passport renewal forms. The embedded URL `https://trafffe.ru/aws?utm_term=renewal+of+passport+form+mauritius` is a primary indicator of the phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafffe.ru/aws?utm_term=renewal+of+passport+form+mauritius
    • https://mafakovik.weebly.com/uploads/1/3/5/3/135347242/2867568.pdf
    • https://static.s123-cdn-static.com/uploads/4444114/normal_5fe15a8d685fb.pdf
    • https://site-1168218.mozfiles.com/files/1168218/jofexegewurobudulezi.pdf
    • https://kenibojowosude.weebly.com/uploads/1/3/5/3/135324683/104f058ea.pdf
    • https://site-1226161.mozfiles.com/files/1226161/39994122572.pdf
    • https://cdn.sqhk.co/xuxiropuwomo/QnXbihb/popizolewogopujo.pdf
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/101f868f.pdf
    • https://cdn.sqhk.co/sijiposago/hb2iha4/makedadexizuxixulerumaf.pdf
    • https://static.s123-cdn-static.com/uploads/4385412/normal_5fe2927fc29c0.pdf
    • https://cdn.sqhk.co/zupodejadofe/hdEjfAn/pisagitiweniluxejigej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/welanisowari/xasoz.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_off0000ce20.bin
123a29682c8ef5bcc7ce77c60e85cf0b735cad36cf950b5982037522fb4fd941
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 5148 bytes
font_01_sfnt_off0000dfaa.bin
b115e4c9b51bc62571547105e4188fac9b31c838b777e5d1177644bb36494f30
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 10648 bytes