Malicious PDF — malware analysis report

Static analysis result for SHA-256 2165486b6cd9bc62…

MALICIOUS

PDF

74.5 KB Created: 2020-11-14 10:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3f405060d626366fc5575227d2b75ee2 SHA-1: 17195ef4d9143dcffaadab148866757f63331fc2 SHA-256: 2165486b6cd9bc62217607e4ab137b19a978a9b9ed9b4e43db3b9aaebaee251c
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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=sujok+six+ki+treatment+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423714/normal_5fae0fa41d8e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_5faabb5c0d424.pdfIn PDF document text
    • https://motazejiwe.weebly.com/uploads/1/3/4/2/134266269/zoduxunikugoz-gudejilara-rewaz-tugupedora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_5f9236b637d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_5fad78953f5c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456376/normal_5fa22a7131fc8.pdfIn PDF document text
    • https://dadixuva.weebly.com/uploads/1/3/4/0/134018012/782e3b7d9d18cd.pdfIn PDF document text
    • https://bofezukidev.weebly.com/uploads/1/3/4/4/134464138/8447967.pdfIn PDF document text
    • https://papazutizo.weebly.com/uploads/1/3/4/4/134467207/8777688.pdfIn PDF document text
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/6622715.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/debajonisus.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/09427ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_5f9ec7c55cb73.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xupimaral/newest_season_of_the_flash.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/nefakamotine.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_off0000ce04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE04 5468 bytes
SHA-256: f07f25a6ac3bdcc11c3336deb81a27f82d984744ac8c756d1deefdebd344a45b
font_01_sfnt_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 11256 bytes
SHA-256: 18d6099122a1e1aea4ae4bfb4c537f45af488b1084c783a3ed005acce35ebf75
font_02_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 16324 bytes
SHA-256: e6d9021675d0d5757d7cc94b1ab24e42200d1507cad2986ba6eda9a0b14d2703

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