Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39ffa78f90b5836…

MALICIOUS

PDF

57.8 KB Created: 2020-12-19 17:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: acb1b667735fef196149b7468c989469 SHA-1: 231300f021aaa75d5a59006b4ef6b98b46e58254 SHA-256: d39ffa78f90b583635a2d5095475c89f78cc2474eeb1a67c50ceb83a764ff23c
156 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 0.9996

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 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.
  • 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://traffine.ru/123?utm_term=diy+stirling+engine+plans PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384320/normal_5f99499d1a090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_5fae3be8567be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5f87bcff6a8f7.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/78432a418083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f87354c42b2b.pdfIn PDF document text
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/1496885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5f90cd957ee51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5fbc6f555c3a2.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/8095abbd-f346-45e6-b316-44a7decf5acb/pozumonutexafepejezumuvat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865ae2de-dd92-4d6a-8005-100cedc5817f/42830835359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e4d104-88c7-4508-81bf-6596e98dd61f/55241952483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863dbcae-4fe2-465d-9e41-1adb8292c39d/how_to_survive_without_a_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7e8f12-aed5-4843-83e7-06c53a5de7ee/team_fight_tactics_guide_reddit.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_off0000a8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8FE 5088 bytes
SHA-256: 80f49fb111d49b86194f86a45a6d9e1bad4b0f87f9d2f2badaacc1d5e1b64eac
font_01_sfnt_off0000ba6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6C 9456 bytes
SHA-256: d910da041876d89cbc6c8646309f1bfa8f0e5771f3bf97e5cf5071d4df09e4cc

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