Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01fab541f05d081…

MALICIOUS

PDF

62.8 KB Created: 2021-03-03 19:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ef4fdd44bcf3308bc325fce426629fe3 SHA-1: 8bdc40f0c7d820ae5657f288dcdb9f4349ebd104 SHA-256: a01fab541f05d0810323e87f910780bc7d7be4e1e48465bd5339f9dcc0a579eb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to potentially harmful content.

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://dugedepap.ru/wb?keyword=charlie%20hooper%20charisma%20on%20command PDF link annotation
    • http://pakimudemezir.iblogger.org/sajubu.pdfIn PDF document text
    • https://migapivali.weebly.com/uploads/1/3/1/3/131381101/965a01ead97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_6012f7ba65297.pdfIn PDF document text
    • http://natbeach.space/zelda_botw_dlc_1_guideyeini.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/fQbWG82/sensitivity_for_pubg_mobile.pdfIn PDF document text
    • http://clubstore.pro/envelope_address_format_in_wordb5i04.pdfIn PDF document text
    • https://patufefuwo.weebly.com/uploads/1/3/4/3/134312622/tepumivuwur.pdfIn PDF document text
    • https://musigimipipo.weebly.com/uploads/1/3/4/4/134470090/lexifumilozizufuzik.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/93781344353wc9v0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wifavar.epizy.com/stihl_bg_55_parts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/how_to_change_master_code_adt_blue.pdfIn PDF document text
    • http://negavutagogo.epizy.com/81994515062.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_off0000bc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC64 5220 bytes
SHA-256: 9e78e8ff36afbbabdb97a9c84f9a16809cd733b2c599188387e2d1b85440d19d
font_01_sfnt_off0000cded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDED 9516 bytes
SHA-256: 21a22b3b336543e039020298cddea171b74d308985497ba27edd3b78dc35e2ce

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