Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d6ae642ddc0b20…

MALICIOUS

PDF

69.4 KB Created: 2020-11-27 13:21:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f4bfa553007ee07e23abc64515942312 SHA-1: 90833cd6f3fd70d3b912fc4e87f60ac24f4abb87 SHA-256: 96d6ae642ddc0b20355bbab5fa0aaa419ab2ebf67d0fa85427d373eac58bd121
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 0.9995

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://trafffe.ru/strik?utm_term=fernando+arce+necaxa PDF link annotation
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/baxuvesot-nizavij.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/dc7d7d58-7d93-4640-89e3-b0fd34c0cd98/libro_achievers_b1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d342434-4adf-4c95-81bd-430bc651659b/91215164062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90d612e0-5418-4075-b388-5a5c2b837995/36726335190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74292b0-479d-42a5-bec9-9ab9f9238079/xakebojuzexak.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/fopakilezozidot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597bc05a-c480-41a0-8843-fd93eae5449f/xanururuxipor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1eb9fc8-393e-4075-8fa2-986760c3443d/la_fitness_member_key_tag_lookup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68688c79-579b-4eb1-b503-25db53fe0a70/10652557662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582e4897-5021-4548-a21c-145b5789d01a/bemedagulorowola.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB41 4744 bytes
SHA-256: 6acdaab9714e2edc6841859fc2f70b6877a6adbc50114e90daa10709dce81e6c
font_01_sfnt_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 12032 bytes
SHA-256: f896942f34ca799d9762187489af6c434c55f6abb2b710353cb979f37f72c89f
font_02_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 16116 bytes
SHA-256: afbdbd02dec82d9be1e07df9ab92004d6e2996c86bdcb9c83a2c1f8ac0d08daa

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