Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6513d803adb509…

MALICIOUS

PDF

63.9 KB Created: 2020-11-11 05:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c003af7b2f860a42d05c69cc324e6724 SHA-1: 33466663a9e7c8709d2f8e67fd8d04107e11982e SHA-256: ac6513d803adb509f696f530089515adb02a24760df58075f171200267001b59
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute links across potentially malicious or low-reputation sites. No scripts were extracted, but the overall structure and URL distribution point towards an attempt to redirect users to malicious content.

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/aws?keyword=perez+mata+francisco+md+seattle PDF link annotation
    • https://wiworixoso.weebly.com/uploads/1/3/4/3/134321663/2104862.pdfIn PDF document text
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/8552759.pdfIn PDF document text
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/bejoxap.pdfIn PDF document text
    • https://bovitala.weebly.com/uploads/1/3/4/4/134497817/4764212.pdfIn PDF document text
    • https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/9753575.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/gevoderovepiru.pdfIn PDF document text
    • https://taruzabob.weebly.com/uploads/1/3/4/4/134493447/02076e706f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5fa298b747202.pdfIn PDF document text
    • https://tuvomirunasoz.weebly.com/uploads/1/3/4/3/134324776/fipobusevibixit_pujuzozozowa_buzosuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_5f9bcc6b2ddbe.pdfIn PDF document text
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/muwawesijotedupamebu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowonovege/bitcoin_faucet_collector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/tusaxifun.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_off0000bc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2A 5216 bytes
SHA-256: e589c8355d282397ff03a52d9877316a7623028f721efdba8ef0ece587a99386
font_01_sfnt_off0000cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 11268 bytes
SHA-256: a955be3bb226904443ea8ac0235d7e7c7aa493ae1651e5d03e57044de0ca0955