Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c09f894dc4a44b…

MALICIOUS

PDF

89.5 KB Created: 2021-05-29 18:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 44f3a973af0a24517c3b8c5933806deb SHA-1: 946a9b098d063df7a3019ed4722687a5a19efaf1 SHA-256: c2c09f894dc4a44b738d2bd8128c3d85bceb15915cd81708ed71f0edd7c7f0fc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=pokemon+roms+for+ppsspp+gold PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443617/normal_600a580a25f9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408588/normal_5fc6986721b91.pdfIn PDF document text
    • https://bobilomagavakux.weebly.com/uploads/1/3/4/8/134868487/759760.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366397/normal_5fe3a59cf2611.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/650287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_6056f37f3abe5.pdfIn PDF document text
    • https://luludexo.weebly.com/uploads/1/3/5/3/135322363/9588867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_605590e279311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415543/normal_60683c4fd0382.pdfIn PDF document text
    • https://tuvuneboginat.weebly.com/uploads/1/3/1/6/131606819/mameponeremol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_6057b62ecf96a.pdfIn PDF document text
    • https://sawonelezaxiso.weebly.com/uploads/1/3/4/5/134588179/lapivop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483083/normal_5fc75053a56e8.pdfIn PDF document text
    • https://rerararomimin.weebly.com/uploads/1/3/1/3/131383042/3955595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_6023df46201f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483873/normal_5ffc1dd5f0dbf.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/9441609.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414860/normal_60089c0f9269a.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/8aab291a-ec47-432a-bfca-b99393cc364c/is_flight_sim_on_xbox_game_pass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9a4f57-203c-431e-8ca6-0457ab76e14c/91120491165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e54627-a77e-43d9-a3d6-6f1e159aeb3c/girl_interrupted_movie_plot_summary.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_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 5216 bytes
SHA-256: 173f2d58ae8b1d33da80c2455aa4c0257998dce39c115ec772272007f91471f3
font_01_sfnt_off00011b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B49 11356 bytes
SHA-256: e3ad864ce53f8fad283fd2321cb31f90792a6d44c64548e879a15be73956f307
font_02_sfnt_off0001426d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426D 16404 bytes
SHA-256: f0b3dd3c0566fc66908a561f11494c804a3370523e84f8e53efd186cd3790333