Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf879c79b4fc5c0…

MALICIOUS

PDF

66.1 KB Created: 2021-02-23 16:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 228ed24021a4325883fab32e29f096b1 SHA-1: 5ad526d1faeb744fe10360850bf972a395e17e6e SHA-256: 7bf879c79b4fc5c040c4ee71479233bb4290b03a53c5b6aba823efd244ac1a99
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the ML classification strongly suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/strik?utm_term=belgium+browning+9mm+serial+numbers PDF link annotation
    • https://cdn.sqhk.co/tadeketoxab/LjaibbW/sago_mini_music_box_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/ieicfjf/download_game_baseball_9_mod_apk_putra_adam.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/jhhQZQp/quick_and_easy_baking_recipes_with_few_ingredients.pdfIn PDF document text
    • https://bavopasivivewid.weebly.com/uploads/1/3/0/7/130738836/sefowu.pdfIn PDF document text
    • https://tujewadis.weebly.com/uploads/1/3/5/3/135312055/welikuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fde534e9ceaf.pdfIn PDF document text
    • https://jotevalosovem.weebly.com/uploads/1/3/4/3/134385082/powexogim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_5fd9a819d9427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_602b6cc1de16f.pdfIn PDF document text
    • https://tevunuxewime.weebly.com/uploads/1/3/1/4/131452804/6e787613e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_6018c354410d3.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/7ijF9hg/96817448409.pdfIn PDF document text
    • https://tewuzafigew.weebly.com/uploads/1/3/4/3/134339743/vavibafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B1 5440 bytes
SHA-256: 518efe5fb8e3084980366fe8cccec0990f27ced188b91d94b6723a1f3c8ce53f
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 10296 bytes
SHA-256: 95899c20a46ac1a1d9057647c1b38a04a5b8c88059e824ed567b030bd8e88ffb

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