Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61700cd20f3d5aa…

MALICIOUS

PDF

77.0 KB Created: 2021-01-17 20:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 737c2f676454fbe2802277953acc9bfb SHA-1: 9bdf9a7d13aa0a8c505d65d6b7733cb568b761c4 SHA-256: a61700cd20f3d5aa36a3f38aedac26f08c16dad60cef6ce7c9a82a542e89c3ea
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=starcraft+2+tactics+protoss PDF link annotation
    • https://site-1175878.mozfiles.com/files/1175878/ups_careers_gonzales_la.pdfIn PDF document text
    • https://site-1219602.mozfiles.com/files/1219602/5747839988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_5fd39a6ac8295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393034/normal_5ffaaf2aafbca.pdfIn PDF document text
    • https://xitemexum.weebly.com/uploads/1/3/4/3/134311382/2277081.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_60039b59332d4.pdfIn PDF document text
    • https://site-1199955.mozfiles.com/files/1199955/fisiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5f90c71e0ddf2.pdfIn PDF document text
    • https://vozopameniv.weebly.com/uploads/1/3/4/5/134593493/lukuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f9bd62b87704.pdfIn PDF document text
    • http://vovidumuf.22web.org/difixubil.pdfIn PDF document text
    • https://site-1180637.mozfiles.com/files/1180637/75040728884.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/7addc9b8a.pdfIn PDF document text
    • https://nizomepovunamox.weebly.com/uploads/1/3/4/3/134305669/pawixago-nefotobuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kamaxunavag.epizy.com/pawetezaxuporasisudu.pdfIn PDF document text
    • http://robinovedibepo.epizy.com/93804759093.pdfIn PDF document text
    • http://katezoluvezile.epizy.com/80341450964.pdfIn PDF document text
    • http://marivugedada.epizy.com/55020474366.pdfIn PDF document text
    • http://dipulitexaxuz.epizy.com/95379793238.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/ergomed_annual_report.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 5212 bytes
SHA-256: bac43780f5261ccfcd48f30f195265734c352367e627ca39b1e3892d4be555a6
font_01_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 10676 bytes
SHA-256: f0872fc61bfa2f5de2f57276e0ab45f7f2ea044cec05a32c4d67e17c0bc7653c

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