Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3f0d4902c499cb…

MALICIOUS

PDF

100.5 KB Created: 2020-11-25 18:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 99b773ade7c5a281a5061fbabd9a7db8 SHA-1: d3ee10f0afb1e75a4bb7a257ecdd0182b37a049a SHA-256: fe3f0d4902c499cb2da41e9c1e2bf7aa2f778d570491b25ec95ec004d8083b7a
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=quincy+jones+songs+he+sang PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5f9cdde987be7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5fb99cd9cb58d.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/ruxopovalidolesugobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_5f9b8b0d8414f.pdfIn PDF document text
    • https://suvejuxib.weebly.com/uploads/1/3/4/3/134380783/5948394.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/tojabixefova/gupinukaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a20584d-7f8d-4013-a795-60ec76dcb118/can_pregnant_sims_die_sims_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40663099-4a8d-4d66-b754-467c87bb2095/mupej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9b37ae-f75a-4ce2-8a7f-e920a2f2256e/sipegiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480ee221-5b0d-49a6-b831-b91fb3c634a0/nukoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8584c8-756f-4cc6-a1d3-9cd54eefc21f/fluid_power_with_applications_anthony_esposito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29cac37f-aca5-4114-a9a4-e6cfc7dc958d/capital_lighting_columbus_polaris.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_off00014a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2D 5172 bytes
SHA-256: b8be74a2c7f76b7dd02cb3e5ce144f1f778601c59e8617fc349b540474a66dd6
font_01_sfnt_off00015bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD7 12340 bytes
SHA-256: 4bba504f4d18ced5c81db885752c8ac67b8f164061c39124e924345d953562d3

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