Malicious PDF — malware analysis report

Static analysis result for SHA-256 a692ac9ef84a06e2…

MALICIOUS

PDF

65.1 KB Created: 2021-01-09 17:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03bf5468b662d47ea94ee75e1ad8cd24 SHA-1: 905e7850276db52b280824370a5a85518b9dafad SHA-256: a692ac9ef84a06e20363d9a3357b4ec0c9af1645cbbdbe3e2f9a3e93d431f22c
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall detection profile indicate a likely phishing or malicious redirection attempt.

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://trafftec.ru/aws?utm_term=easy+chocolate+cake+recipe+pdf
    • https://zamokofoviwikaz.weebly.com/uploads/1/3/0/8/130815095/16be7bcfb96f.pdf
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/8268966.pdf
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5fa5f801b7b58.pdf
    • https://cdn.sqhk.co/pesuxitum/vDfhf2n/49145767086.pdf
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/domajuwibi.pdf
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/natojitumodos-zidoxefutev-xikuwizovukuti.pdf
    • https://kitivagep.weebly.com/uploads/1/3/0/7/130775950/lutalotite.pdf
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/jesonegexirurikalazo.pdf
    • https://cdn-cms.f-static.net/uploads/4410194/normal_5fa438f100555.pdf
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/jiziteturapiw-xisavolajozu-tesujeregepa.pdf
    • https://jutisopi.weebly.com/uploads/1/3/4/7/134775863/3409420.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pazifetanegapu/duzin.pdf
    • https://s3.amazonaws.com/jarawaxanivu/dadavemo.pdf
    • https://uploads.strikinglycdn.com/files/b52991f4-b1d6-4f5d-81c7-8cb8d35bfe45/loxonugojezusupiruxuju.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_off0000c35e.bin
c146a6149d86920a2b01f09d3809f3d196245a31fe9566a1fee40eac1bfa5ada		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC35E 5364 bytes
font_01_sfnt_off0000d5a2.bin
3f7e92058ce423acf62bd63d887f0605713ff8b4215682c98645861cdda00de8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 9948 bytes

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