Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85a52725db45a4e…

MALICIOUS

PDF

77.0 KB Created: 2020-11-19 23:23:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 35af4d76e38429842ed1449c9657a96d SHA-1: d708c93e11a941d64dc4b7d99d2e31270b59f232 SHA-256: c85a52725db45a4ecbef22d14cf844be50915024f26c48216a207c8e92a102f1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://traffset.ru/strik?utm_term=clasificaci%25C3%25B3n+de+virus PDF link annotation
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/3510807.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/8f059b.pdfIn PDF document text
    • https://lefoxidegej.weebly.com/uploads/1/3/4/5/134526886/9301f91882f56b0.pdfIn PDF document text
    • https://mogunugive.weebly.com/uploads/1/3/4/3/134381007/raduvigumomakomujapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_5fa3229cbd3de.pdfIn PDF document text
    • https://miwunukeje.weebly.com/uploads/1/3/4/5/134524605/vowafopewefo.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/d37c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a21405-e950-4611-a32e-91dcb6460b48/74871302103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc2ba0e-55d4-4af8-8f01-616013f33324/55002930079.pdfIn PDF document text
    • https://s3.amazonaws.com/xatojem/66946483173.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/trivium_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732a3053-213c-46a7-b25b-331cef4a74c7/55744551588.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 5116 bytes
SHA-256: 2b265407ea88c01a3a5e6005a079a986a65b1d5c99641068bb44e94ee20d2ce6
font_01_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 1664 bytes
SHA-256: 6efbc44be7960b47cad727d6ee1d5149fe1172d6dc8f233c2aa2edc506f915ff
font_02_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 12144 bytes
SHA-256: 6b7764d8921e97ef4eabed874772ab9bee3bb472ba0beed6620635acf8b8c67e

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