Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61de1d5e9c71a48…

MALICIOUS

PDF

122.4 KB Created: 2021-02-15 10:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 284fc713e652775f2068421dc2932c1d SHA-1: 53c9974a48c0a61b242af141c8f0dcecbeb66e9c SHA-256: b61de1d5e9c71a48d62aa144da772c8cd168c3c6e418e30ad9ad006e81ffa376
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URIs indicate a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=the+raven+remastered+walkthrough+xbox+one PDF link annotation
    • https://cdn.sqhk.co/miviluwulux/hhuibGH/97583945977.pdfIn PDF document text
    • http://4bochki.ru/91805859878lo6el.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/SKgf1P4/51724111324.pdfIn PDF document text
    • http://heretythere.site/yoga_1080_albertgasseml2xh.pdfIn PDF document text
    • http://jirafka.space/sumedaxa7on9.pdfIn PDF document text
    • https://cdn.sqhk.co/lotivadafe/eghhjcs/69139550712.pdfIn PDF document text
    • http://verifybadgehelp.com/46405665251tgmc7.pdfIn PDF document text
    • http://khanapoorti.com/actuarial_mathematics_textbookftj65.pdfIn PDF document text
    • http://tufidifegoz.66ghz.com/attendance_allowance_forms_phone_number.pdfIn PDF document text
    • http://girlita.space/touhoumon_another_world_guidebf29m.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/uueidgj/zanofakaxibozil.pdfIn PDF document text
    • https://cdn.sqhk.co/liredubi/dhaIej0/70251188002.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisilakifejil.rf.gd/adda_247_all_books.pdfIn PDF document text
    • http://lozebaloporan.epizy.com/96407964215.pdfIn PDF document text
    • http://vupikefugogulup.epizy.com/estimate_template_for_numbers.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_off0001a4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4AC 5612 bytes
SHA-256: 95194941e399846bd253ae127df044035f79fe6c2c0f130850293293d4c5fa42
font_01_sfnt_off0001b7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7AB 10624 bytes
SHA-256: b541d767c4212ef03513917769209121094e460c34f07c77191274da9eda2e07

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