Malicious PDF — malware analysis report

Static analysis result for SHA-256 274791c9e3ca5872…

MALICIOUS

PDF

75.5 KB Created: 2020-12-31 01:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ef032040713b99d41c8875c5860078e5 SHA-1: 1043cae7e385b829ebdb2dd12766c67501ce8c80 SHA-256: 274791c9e3ca58724915f8c6f7c117c5ee505b0dcf7ae4cfde1c0b0008768cf3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farming or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external links, with one pointing to 'https://trafffe.ru/strik?utm_term=general+online+quiz'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=general+online+quiz PDF link annotation
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/c83e060a5b81.pdfIn PDF document text
    • https://cdn.sqhk.co/dovewobojeb/9ijhihi/guilty_crown_wiki_characters.pdfIn PDF document text
    • https://mukeluxera.weebly.com/uploads/1/3/4/5/134528716/a4428d9a5ae84.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/341812bef9c7893.pdfIn PDF document text
    • https://cdn.sqhk.co/mofipife/imfgdgj/crowd_run_3d_popular_crowd_city_wars.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vebenok/wosumegiguxozebupazuluve.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/aprendizajes_clave_tercer_grado.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/nofufarawevevux.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/horse_carriage_3d_model_free.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/walevoxekozotidesi.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/areas_of_knowledge_tok_ib.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/checkbox_android_studio_listener.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/75058855738.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 4508 bytes
SHA-256: aaf206b4de30fe589d4314925709b9843cf20d9da1e691c770b8ec5b7ee03aaf
font_01_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 10236 bytes
SHA-256: bdc40b94a32d2ea12abd32da29022edc162b6ed04b010fd63ce14c3a19044568
font_02_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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