Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f7099cb2ed3107…

MALICIOUS

PDF

65.7 KB Created: 2020-11-17 17:06:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c827e4b477599e5a01f3453fc0aee06d SHA-1: 933cfa3d4de75f5cdfef15e75501e11a37d53c0a SHA-256: c8f7099cb2ed310730d0caab121b26d6c26ab424d938b9e191fcd69be58a4c1d
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://traffking.ru/123?utm_term=yummy+mummy+parents+guide PDF link annotation
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/vitadusuw-sexuk-maximabili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f889326c88ac.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/9736769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_5f99b2d81d8d3.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/3943693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_5faaac091bedb.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/vojibiwemaza.pdfIn PDF document text
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/muruxatoxofefugopoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_5fb2f6981ae0d.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/3eec234b-6cb6-4bb1-a2d2-5190e0e63dfe/65012042103.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/cheppave_chirugali_movie_background_music_ringtones.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_off0000c6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B0 5312 bytes
SHA-256: 552e523fb2c337ffdd0024354491197b62924dcce7b956acfebcb51240b81ea3
font_01_sfnt_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 9672 bytes
SHA-256: 534f3ad7a68907169f11fa0224012cf26c6e1693fc5b0d2a6f882307bca5be55

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