Malicious PDF — malware analysis report

Static analysis result for SHA-256 892d0da7e90c881d…

MALICIOUS

PDF

69.4 KB Created: 2021-02-20 01:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e1d0ca9b36595e5b75e755509156a18e SHA-1: aa0adc66f5be62efe5b7585eb938d08e9a559945 SHA-256: 892d0da7e90c881dbd86019f922efd240db3ac2008e28f102c9f1371a8943f69
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. The document body, though heavily obfuscated, contains a query about sharpening services, likely a lure to encourage clicks on the malicious links.

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://leonvi.ru/123?utm_term=where+can+i+get+my+wahl+clippers+sharpened PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383702/normal_600be0d6da708.pdfIn PDF document text
    • http://mini-camera-super.club/ending_scene_piano_sheetp60zr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_60295cf7c9201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448129/normal_5fd145aeb4167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_6017061129fbd.pdfIn PDF document text
    • http://lenudes.com/dodalibikofezodiduv33ncr.pdfIn PDF document text
    • http://yesitalia.fun/what_is_the_salary_of_a_digital_marketing_managervhga3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465402/normal_5fce06999af39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_602d0e656ac19.pdfIn PDF document text
    • http://umkatrade.ru/the_killers_ernest_hemingwayyrxw6.pdfIn PDF document text
    • http://shopee24.site/albucasis_on_surgery_and_instrumentsft8f4.pdfIn PDF document text
    • http://bigtittybella.com/telehealth_therapy_across_state_lines_2020pkl2r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_6012b84820430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tikikenuf.epizy.com/fuzisopikezuse.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_off0000d289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 5696 bytes
SHA-256: bba66539db2fe269398e5c18475036834919a2f73edf13c5675f0b09eeaf9b35
font_01_sfnt_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 10156 bytes
SHA-256: 8c50f0bfda7e2f1e6a7053cbeabea6cfced3dd94fdeebf57f4a8ca1a40b708a0

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