Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b14c5301dc6f65…

MALICIOUS

PDF

65.4 KB Created: 2021-03-06 10:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9270e300d9a2af308036ad523e8bd51a SHA-1: ae1ed9a632c788018762b794c473ef08d5d14b8b SHA-256: f9b14c5301dc6f652a90ecee1c1cba144acda1ee095ec59709c419240a817ec8
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to snowblower engine issues, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xezojetit.ru/aws?utm_term=what+causes+a+snowblower+engine+to+surge PDF link annotation
    • http://vittorguxx.site/bobogovurewefixebek67oy.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/5758550.pdfIn PDF document text
    • http://xagonezunoli.iblogger.org/lijixolowomet.pdfIn PDF document text
    • http://bluebadge-support.com/83101377574denwo.pdfIn PDF document text
    • http://wofeboz.66ghz.com/kasur.pdfIn PDF document text
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/b8a13a9a8c7ceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_603456f9a5765.pdfIn PDF document text
    • http://islta.fun/764449144419ryqx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_5fda93bc6bb6d.pdfIn PDF document text
    • https://bebojeraje.weebly.com/uploads/1/3/5/3/135302211/2444984.pdfIn PDF document text
    • https://bazofaxeretaw.weebly.com/uploads/1/3/4/8/134868688/zixiwesepexija-dudowojikolekos.pdfIn PDF document text
    • https://namadifudemabum.weebly.com/uploads/1/3/0/8/130813063/piwojiwata-rupipedoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_8066c137d8a64b7ea639d2190aedd9f7.pdf?index=trueIn PDF document text
    • http://womepulus.epizy.com/68992282336.pdfIn PDF document text
    • http://kagilabitivibe.epizy.com/44676536057.pdfIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_f4b44631a8c241c0a62e372d3af49b7a.pdf?index=trueIn PDF document text
    • http://renunuxuxalebav.epizy.com/65950232498.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_off0000c5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AC 5304 bytes
SHA-256: 83d78b97a8d0f048da684a9c51f5b50b13df668842a974e3f3a678b31a7a0f55
font_01_sfnt_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 9584 bytes
SHA-256: c3c2836deac54b21eab6b44203bfd85f880416d2f8279be2003494208ee80656

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