Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95abe1fbaa965db…

MALICIOUS

PDF

78.3 KB Created: 2021-02-15 09:54:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: aa0bf223b2ee0d7e64a3cd58618a2420 SHA-1: 8e38b01bf81b2e64ec25dd2f9b6b81f8c5a43e87 SHA-256: b95abe1fbaa965db28b4ff0aafb181d670dd87c079085c4feaea3459a15263e9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the heuristic indicating a link farm on disposable hosting strongly suggest a phishing or malware distribution attempt.

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://jacksth.ru/strik?utm_term=slice+of+life+manga+to+read PDF link annotation
    • http://bhd-management.space/bmw_r1250gs_owners_manuallfmxs.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jjymDij/79130480163.pdfIn PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/654c0b78bfa.pdfIn PDF document text
    • https://tiwapopo.weebly.com/uploads/1/3/0/7/130739059/jabowexapoxudabepego.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460980/normal_5ffd2a50e76ea.pdfIn PDF document text
    • http://2022god.com/27335190808pace6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5fd84ee0b194f.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/ficjdbH/22417702066.pdfIn PDF document text
    • http://jobs-ingenieur.best/sejulesotitifize6igp.pdfIn PDF document text
    • http://ebay-coupon.ru/mapa_de_metro_amsterdampr8lr.pdfIn PDF document text
    • https://cdn.sqhk.co/bezugisav/hbhcQij/best_craft_beer_selection_store_near_me.pdfIn PDF document text
    • http://maslovauto.ru/zipuxi1eowk.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
    • http://wupubobetob.epizy.com/46131686947.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_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 5056 bytes
SHA-256: 9df594aa2408f7d76adf51fbfa8413e59ae7df44371d362e9b193fdf1a046370
font_01_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 10648 bytes
SHA-256: 2d7a0ef5f9c142addd16873027de70059aba079829481c98b7e874d236afacbc
font_02_sfnt_off00011ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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