Malicious PDF — malware analysis report

Static analysis result for SHA-256 8788ff4c6615ca8c…

MALICIOUS

PDF

74.1 KB Created: 2021-05-07 16:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ef87b2be5ffca950d4f0d962672b40a SHA-1: 968775ad8b580bcd0eeed8c02ba9ab947cfd818d SHA-256: 8788ff4c6615ca8cc3eff08536aacaf54448a2eeded1e8faf4f0f614e44e8dba
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous external links, including one to 'vilenefex.ru', suggesting an attempt to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a deliberate effort to create a large number of outbound links, likely for malicious purposes such as SEO manipulation or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=toro+power+clear+518+ze+carburetor
    • https://cdn-cms.f-static.net/uploads/4450512/normal_6049dec957a9e.pdf
    • http://spainsale.pro/zorididivirusalawasegn096.pdf
    • https://cdn-cms.f-static.net/uploads/4488580/normal_600fbc0f54274.pdf
    • http://kittyplay.online/polk_audio_dxi_12_inch_subwooferjqdrq.pdf
    • https://cdn-cms.f-static.net/uploads/4501214/normal_605b567eaf3a7.pdf
    • https://static.s123-cdn-static.com/uploads/4380219/normal_5ffb099a7667b.pdf
    • https://static.s123-cdn-static.com/uploads/4383798/normal_5ff9d7cda61cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_94bff1107266466795f393ff09482ae7.pdf?index=true
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_a723f2d65c3a41a6a532dd0f74693bcc.pdf?index=true
    • https://s3.amazonaws.com/gozifep/attendance_register_format_for_office.pdf
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_cfebcda3876f4b989a3ea33f0fd2ce8e.pdf?index=true
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_ad03b21996dc4e9d8cfaaa659ff90c82.pdf?index=true
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_80a00742e7884c0c8737759a2f6c37eb.pdf?index=true
    • https://s3.amazonaws.com/lakujusitejojet/what_is_difference_between_expiry_date_and_shelf_life.pdf
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_c2138f5c56f8462ebcddbef783611877.pdf?index=true
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_9a8ae0ba8a194ffcaf6dc5122ed35765.pdf?index=true
    • https://1dda4824-043e-406b-9213-03d4b91bb4d1.filesusr.com/ugd/7695bb_3d003c4fbe2d4e5480446260db6bcc2c.pdf?index=true
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_350cddb3e87d4d7e86f10b4ea2049bbd.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e200.bin
634b156c461eb6e5865ecbba0dcb1eed9199dcd01208be3d3b5f767b69cfc93c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 5348 bytes
font_01_sfnt_off0000f460.bin
afb122b25a317d5548dcebf0ff1e43a532329486a2cc8bf2e22c0e03e6633dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 11424 bytes

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