Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fffe5f934567e7…

MALICIOUS

PDF

75.1 KB Created: 2021-06-07 09:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 86d8ab3fe26772b5a30973e9123724b7 SHA-1: edab35ecb772ac27a8b3ad05d1ef501b330f954a SHA-256: 80fffe5f934567e7780b40bf126787ab54b2f88301b861844c10142231cd2562
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external links, with one prominent URL being https://pistant.ru/pbw?utm_term=wind+of+change+mp3+320kbps. The document's structure and the presence of many external links suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/pbw?utm_term=wind+of+change+mp3+320kbps PDF link annotation
    • https://mesovozilepako.weebly.com/uploads/1/3/4/5/134588792/6321029.pdfIn PDF document text
    • https://litiwufedoza.weebly.com/uploads/1/3/0/7/130739575/291559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_5fd73adfeb5ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416495/normal_5fc5ebdd9c586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413703/normal_6001d768264ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_6018be0e70000.pdfIn PDF document text
    • https://bojozavo.weebly.com/uploads/1/3/0/7/130740433/8ca8be1d0e61.pdfIn PDF document text
    • https://zudumatiwa.weebly.com/uploads/1/3/0/8/130873708/9228676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_6038e2d65a894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_60240adf05b07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479707/normal_600819cb39c5b.pdfIn PDF document text
    • https://filojekejo.weebly.com/uploads/1/3/4/4/134446685/kupav.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/f7aef03c-46e2-440f-a163-ac76c9116f94/fahrenheit_451_part_2_crossword_puzzle_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1cac734-1e37-4062-8429-cb5768b79e98/peruxabololofubudiv.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144439311/39466687264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a03238-9378-4969-8a21-3d55bfa93faf/51579858076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50946720-c538-4cb4-af5b-ab9bcbc30688/xaximero.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/w/file/fetch/144558510/como_descargar_pokemon_x_para_pc_sin_emulador.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ac42bd-6054-4da2-b24f-abf72d310f17/bissell_symphony_pet_all-in-one_vacuum__steam_mop_reviews.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 6096 bytes
SHA-256: 2a6fd8e41c978af01e31bf25f046d3c4cb42754a7d6ecdd8db414da863a43355
font_01_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 16076 bytes
SHA-256: 97ca48e6d408801d04109dd2693b2fe946cc4915577e1e0dbd5b1d128751b758