Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9f7bac22ce54e8…

MALICIOUS

PDF

104.4 KB Created: 2020-12-21 00:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0417282fce2b752b0f7a53699cabbdb3 SHA-1: c5b3dc45d7e5da5c71237c074883182f527ca4d4 SHA-256: 3d9f7bac22ce54e8838e8166bd218073ab88b5e768e8eb59d1180b431715dbc7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The primary attack pattern observed is the embedding of a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://trafffi.ru/123?utm_term=clayton+price+c%252B%252B', is particularly suspicious and likely leads to a malicious payload or phishing site. No scripts were extracted, but the PDF structure itself is designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=clayton+price+c%252B%252B PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5f883d13b371c.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/8948163.pdfIn PDF document text
    • https://gugekeki.weebly.com/uploads/1/3/4/3/134374678/nenanamiw_zepuzurojuzinu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381756/normal_5fce85e00257e.pdfIn PDF document text
    • https://wibakaxidame.weebly.com/uploads/1/3/2/7/132741334/8731917.pdfIn PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/sazuxakokoleneju.pdfIn PDF document text
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/1432782.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/xoxopivul.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/3b60002f-06ee-4726-8f47-0bd22b23da3c/15777088263.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0055e5687f52b6b7c450a/t/5fc120bb9ee0f32b877b270f/1606492347701/deep_learning_algorithms_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34520197-e6e6-4e6d-adaf-0681fa237e35/rick_and_morty_april_fools_episode.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6675ec14dfd36fe172514/t/5fc88d23d32d012678fcf2a4/1606978859797/resident_evil_4_walkthrough_chapter_1.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbceef568bfc51861666a46/1606217463442/what_is_ahr.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_off000143d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D9 4756 bytes
SHA-256: e67720f066317f1a333e6df62c6f8e531416a1ac49c9c768851cc5d8a03784d5
font_01_sfnt_off0001541c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1541C 12736 bytes
SHA-256: dbed56a6605382ce65e2b279c24d469c618434d3c1d422969ddae62d0ebae56f
font_02_sfnt_off00017e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E73 16352 bytes
SHA-256: ad7053281d36e24bf7b2a261c22a6f6bb8067977c663944d90816de2648b1452

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