Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0bfa4f211e5de3…

MALICIOUS

PDF

74.7 KB Created: 2020-12-26 00:36:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 48e8325522f7528d879493c8da41dddc SHA-1: b9e98120a6e0e30d634c30fdd7e4b5668c6a5340 SHA-256: be0bfa4f211e5de347a570975e9425487a8ef19a8d146b8bced7bd4cdf478674
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a phishing or redirection scheme. The presence of external URIs and the link farm heuristic strongly suggest the intent is to redirect users to malicious websites.

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://trafffi.ru/123?utm_term=electronegativity+of+carbon+monoxide PDF link annotation
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/145c03a0b6d2ae.pdfIn PDF document text
    • https://werudugin.weebly.com/uploads/1/3/0/8/130873895/jalugibexim.pdfIn PDF document text
    • https://joxorarosod.weebly.com/uploads/1/3/3/9/133999743/1ddd89bd594.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/nutepulodafogodafeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_5fdaaf0ae29c5.pdfIn PDF document text
    • https://lixetilox.weebly.com/uploads/1/3/4/3/134390203/wuxugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/50824245118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/605b125c-90d7-4ea0-a710-4dc41549f46c/89661931157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea06879-48d4-4b7d-9480-58eeb5886cff/yosso_2005_community_cultural_wealth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37915bb5-ba50-46ff-9a25-e7161f115504/5726042717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58ce433-1c3f-4121-8b5c-8974e983f33b/absolute_zero_video_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a475e4b8-777a-473b-b59d-358768ee5098/39438889634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1781c968-c61c-48a5-9f42-cee67041af6c/java_complete_reference_online_reading.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_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 5492 bytes
SHA-256: a07baef5233cbc72687b200ca58a795fc25041c1ebe5864eb153974731fbb317
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 10512 bytes
SHA-256: e067cb551185c149c5b0cbb06bc161186690d979c4084ff3bebaaffc82d83828

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