Malicious PDF — malware analysis report

Static analysis result for SHA-256 043a0dc9eafbaa0b…

MALICIOUS

PDF

79.8 KB Created: 2020-12-24 19:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f72527a8786310f2d9fea8b56e9bc879 SHA-1: 36d8c50b3a8d8703b2c53c3248b8511f0aad1f28 SHA-256: 043a0dc9eafbaa0bb22211b7e952fdda795745d1ef1e80809b46beea42ab46f6
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The presence of a download button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. The ML classifier also flagged this PDF with high confidence, supporting the assessment of a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/strik?utm_term=stickman+backflip+killer+5+apk+mod PDF link annotation
    • https://cdn.sqhk.co/kakumipoman/jgH7K4W/livinezebaruzu.pdfIn PDF document text
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/44f87e.pdfIn PDF document text
    • https://cdn.sqhk.co/biziduwime/eashdja/switzerland_ice_hockey_national_league_table_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424646/normal_5fcf7f4d7d858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5fb2e3b9eb377.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/e4ac6450-d3c1-4ef4-85ad-64b9a410ed77/97247808108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097e4bf7-bb22-4df3-b117-43634c373cd8/tuxegekazewigibidelan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50836b76-83ba-435f-b2a4-9e6103cf7b2e/arrl_grid_chase_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875b6f51-e167-4b25-9e20-6ece6b1712cc/siritelasujusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0886ec9d-39cc-4424-a868-1cc3925c4b1e/macrium_reflect_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e5bd1b-71fc-4525-a19e-2753421720c9/14792399923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162434b5-b446-4c2b-b3e6-d31ebf2f6090/runescape_weapons_guide.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_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 5552 bytes
SHA-256: a75abb2a26f9c81a648ff3d04920a528ef51a73604dc5cdc348be7034724da01
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 11740 bytes
SHA-256: 08ca130cfab7eb4efcc610b1a995d18d04e6ad2d9e92dc829440f4afaf4009d5
font_02_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 16160 bytes
SHA-256: 53c3ec829963ec5a0af1bff4be2d724acb9959b277e5253d769434e6be684fe1

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