Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf67670711ea79d9…

MALICIOUS

PDF

80.8 KB Created: 2020-12-24 13:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d3e3efb9c564382234c585973d94e340 SHA-1: a20092b68c514c771a500484e6bc53715c97f015 SHA-256: bf67670711ea79d91368ec7242394ff308ad5740b0230fcba96b50c1771b9c3b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/aws?utm_term=maple+leaf+ragtime+sheet+music PDF link annotation
    • https://winofugunolef.weebly.com/uploads/1/3/4/8/134846497/tosukewuw-midowuleno-wifinadonikoxuj-zojemivur.pdfIn PDF document text
    • https://bakukumi.weebly.com/uploads/1/3/4/4/134437371/9899bd7228e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487663/normal_5fac08a416a8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_5fbc1e2455b34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471114/normal_5fc777ab61ee0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387219/normal_5fc8b1b37a351.pdfIn PDF document text
    • https://tezugigawezen.weebly.com/uploads/1/3/4/8/134878192/1489625.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/hbPijja/95850088373.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/sjcOgdW/android_tv_box_launcher_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fafa4454a38e.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/ghcNZUw/stone_sculpture_artists_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/wetotuluxe/jbgecPX/xisuxalabipimuf.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/jiifKgf/33022861300.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374704/normal_5fe3e4e9dbb6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_5fd13796589a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 5436 bytes
SHA-256: 1be14a2c934ae542187836cbe06064c1afba75ef2d0930ebad1b3daec29a344a
font_01_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 11100 bytes
SHA-256: b85fd86fa1427b4db970751877e80dd771037818d7ee49672fcbc14c1a84a57b
font_02_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 16100 bytes
SHA-256: 9cfb948b915a4694feeb7f8719f2b65905b0a58e2ed918074a610570d07e7249

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