Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf89efe86fc9be8…

MALICIOUS

PDF

79.7 KB Created: 2021-01-16 09:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fabc2c09031a257168f6ad83e07c6b2b SHA-1: fcb32339b52145d7e46aaf132e063fec2a446d1f SHA-256: 2bf89efe86fc9be8fbe83e632bac3bcaf4c63380c94f22c023ea0a98c53dbbe3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple disposable domains, likely for phishing or malware distribution. The embedded URLs, such as 'https://trafficel.ru/123?utm_term=hampshire+regional+high+school+principal', are suspicious and contribute to the overall malicious nature of the document.

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://trafficel.ru/123?utm_term=hampshire+regional+high+school+principal PDF link annotation
    • https://cdn.sqhk.co/sepokafaru/igoidja/killer_ants_movie_1977.pdfIn PDF document text
    • https://site-1168251.mozfiles.com/files/1168251/blue_heeler_puppies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5f945e6e3e6b2.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/xomewuxo.pdfIn PDF document text
    • https://site-1178670.mozfiles.com/files/1178670/590791016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365594/normal_5fe3b4564b725.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5ffbd5b09bed0.pdfIn PDF document text
    • https://site-1225804.mozfiles.com/files/1225804/56128502434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5fd1bc302a4a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476580/normal_5ffece50a5f2c.pdfIn PDF document text
    • https://site-1200692.mozfiles.com/files/1200692/kaththi_tamil_full_movie_hd.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/6007969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/netinuwa/zuwixapofiwaribebodazisa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 5016 bytes
SHA-256: c8693a3b5d4aa56d44ed68228c306d4c8572de9a897e0f87cb32ec6318564cfc
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 10660 bytes
SHA-256: 0411cff5ed7dfda1e5bdb60ca64e513f14d70c0e430e31d4343c366596b42bc7
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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