Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a3a64afe26fb38…

MALICIOUS

PDF

66.8 KB Created: 2021-02-26 03:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3d3e10ca7226f36cf217926590c4752c SHA-1: 8d8790d2e3ffefd26c0eef07dea674aa0ab825d9 SHA-256: b9a3a64afe26fb38477eede990f800c86c2b0e78a2b172f3833c793e898f5617
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for SEO manipulation or distributing malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

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://jottigo.ru/123?utm_term=what+are+the+elements+of+news+value PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416810/normal_5ff069a5206a2.pdfIn PDF document text
    • http://leopolds.space/adara_katha_sinhala_freerq9h5.pdfIn PDF document text
    • https://bivovupoxewoko.weebly.com/uploads/1/3/1/3/131380626/refudotagosur-zekonemid.pdfIn PDF document text
    • http://jnatural.space/how_to_work_a_receptionist_phone6lqo2.pdfIn PDF document text
    • http://women-ita.space/fosevalosubimabqq8ap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497346/normal_60353dc3eecaa.pdfIn PDF document text
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/84c73d45c77.pdfIn PDF document text
    • http://bluhgang.best/mevurukifevinaxixipibod0m8dq.pdfIn PDF document text
    • http://firstdoctor.xyz/foxifam3rj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fakaxuman.epizy.com/rageza.pdfIn PDF document text
    • http://zuwarikufaz.epizy.com/beachbody_performance_energize_and_recover.pdfIn PDF document text
    • http://safadixuzet.rf.gd/xoloxafavi.pdfIn PDF document text
    • http://kuxejerudaxis.rf.gd/fearless_deluxe_cd.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_off0000cb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 5172 bytes
SHA-256: 42895d83922978d4709013947fef6f37c71e535391b3ce68601e8176829ff812
font_01_sfnt_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 9832 bytes
SHA-256: d30c23e3d72148bd27ae193e1a7f9100e2f75ff17daea9bae69ad07512b7bcb3

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