Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91db76512b290ac…

MALICIOUS

PDF

102.0 KB Created: 2021-01-19 06:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 17426ebc5198fc254c192e6bceaee889 SHA-1: e8be2e9ee138b7587254c12146d67ddeefff4b05 SHA-256: f91db76512b290ac39e4cdc26f9c17459417cf5deb7c1414cc915c26f71298da
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely leading to a malicious second-stage download or credential harvesting site.

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://traffset.ru/123?utm_term=applied+linear+algebra+the+decoupling+principle+pdf PDF link annotation
    • http://zikuwojanubeg.iblogger.org/geography_quiz_questions_and_answers_printable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5fa02cae3bf25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_5f8ea714ac367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5f93a7518a530.pdfIn PDF document text
    • https://site-1177041.mozfiles.com/files/1177041/bsnl_landline_payment_receipt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_5fca2fd3deda5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_5f90b7378fba1.pdfIn PDF document text
    • https://site-1180493.mozfiles.com/files/1180493/diriza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387817/normal_5fc5920a9bd66.pdfIn PDF document text
    • https://site-1179563.mozfiles.com/files/1179563/medieval_wars_in_england.pdfIn PDF document text
    • http://naderuromopuru.22web.org/sigidikuvokutiboba.pdfIn PDF document text
    • https://site-1174800.mozfiles.com/files/1174800/lobekujun.pdfIn PDF document text
    • http://mebesovinu.22web.org/buvop.pdfIn PDF document text
    • https://site-1172255.mozfiles.com/files/1172255/mindsprings_health_frisco.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xegilejefaga.epizy.com/31248005419.pdfIn PDF document text
    • http://tesoxukezeziles.epizy.com/mozosevuxi.pdfIn PDF document text
    • http://kibuwigukakew.epizy.com/23561685909.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/netuw.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_off000150d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D8 5368 bytes
SHA-256: bc1a3a35e69f9bd7ac25fdd2980e6a5154112565adaca31dccbba2d776f4bf68
font_01_sfnt_off00016311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16311 11584 bytes
SHA-256: 098c120774800742ac5f8c2f4218d9b498417fdc57c2a053ba1c04296321544c

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