Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41c2a27e551a574…

MALICIOUS

PDF

70.8 KB Created: 2021-01-25 12:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8ed8c548bc50242b39d9aa4f9f531d0e SHA-1: b5be544cf9060e4c28b53a38a14fc5daedf40621 SHA-256: b41c2a27e551a57403b2572f1c9924d57c6f0f48702e041985a5b0b65d973066
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external URIs suggests an attempt to redirect the user to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://druttle.ru/123?utm_term=french+in+action+transcript PDF link annotation
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/5818517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fd63a343d63b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450036/normal_5fc800322477d.pdfIn PDF document text
    • http://kpupnov.pro/26373479693za8pe.pdfIn PDF document text
    • http://raffle.website/143882719231upxg.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/d0e76ebcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486521/normal_5fca7a9176d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5fd77e16543f9.pdfIn PDF document text
    • http://awpmode.com/50377097957rh05f.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/zuludarev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_60097c9463267.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/Y3CifLW/download_photo_blender_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupanapil.epizy.com/opera_mini_browser_for_java_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/87980160731.pdfIn PDF document text
    • http://kikevanalujik.rf.gd/cad_furniture_blocks.pdfIn PDF document text
    • http://bozalusi.epizy.com/candy_crush_saga_hack_apk_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/41369593408.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_off0000ce6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 4944 bytes
SHA-256: 5e73274437d0a954b7bc82c939de4bc842657ba793e488ebcd741956f827bdab
font_01_sfnt_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 14412 bytes
SHA-256: a2ec3a9b345fb84af48f3357b09ecd7a8a41764ecd80587197db07a3111faf92

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