Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf678a3fc2ba9f32…

MALICIOUS

PDF

85.2 KB Created: 2020-11-10 09:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 14fbc274197024d8dc32e191b267ed3c SHA-1: fde4263ae9522ad9d04728966935996cad3193f4 SHA-256: cf678a3fc2ba9f326e31f5d946c5c76c79326775fefb1f08231c2392b7c93514
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass external link farm, with many URLs pointing to PDF files hosted on various platforms. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous external URIs suggest this document is part of a link farm operation, likely intended to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/wb?keyword=13th%20black%20crusade%20book PDF link annotation
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/jexirex.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/4aae8df0647.pdfIn PDF document text
    • https://sumijiluwovoj.weebly.com/uploads/1/3/4/2/134266387/302419.pdfIn PDF document text
    • https://daluwora.weebly.com/uploads/1/3/4/3/134319963/6410883.pdfIn PDF document text
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/ralajunikipanogotej.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/bae6d554-e1ec-4543-ae12-a84c3cd4cf71/vidusali.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/telezevafatezava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c162a1-9e5d-43c5-a48d-59050a0c04c9/tales_of_majeyal_summoner_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/705d980a-38f2-4c57-a53b-165604039d2a/fosubarox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf73f4b-6a28-464b-8ab5-d535156406ec/2005_toyota_corolla_fuel_pump_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94dc612b-9968-4e38-80be-491d2dfe9b9a/bekazutajonelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e489a6-bca6-40a1-8307-2fe6b512b4c9/tasikijebun.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/46553716761.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 5352 bytes
SHA-256: 131389122b5c1615ad528142a109efa7a462b7cbc2d97817d0ddc6f2beede5f5
font_01_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 11580 bytes
SHA-256: 383eaef551bda8d9ce63940129c880316803cbcdbe6b477c73e70dc7b01f112b

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