Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d99e2a428009a4…

MALICIOUS

PDF

70.4 KB Created: 2021-02-13 16:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: af12447342bb301c11af0fb9523d5881 SHA-1: df03fb08f7c0a6a0c889234ee5cecba176223858 SHA-256: f3d99e2a428009a4f7bd9af609b76aabc889fa2700d32bbd47ce6baab8cc585a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for malicious purposes. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=atv+repair+manuals+free PDF link annotation
    • http://gakmancreatures.ru/dimensional_analysis_worksheet_examplesny4az.pdfIn PDF document text
    • http://obschee.xyz/9798407969hzroe.pdfIn PDF document text
    • http://yeswins.space/platform_bed_wood_storagen31e1.pdfIn PDF document text
    • https://lolifibek.weebly.com/uploads/1/3/4/6/134634661/faduwutufaloposem.pdfIn PDF document text
    • https://nipufosuvomabuz.weebly.com/uploads/1/3/3/9/133999137/3382963.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/hjg5zjg/download_world_war_1945_mod.pdfIn PDF document text
    • http://inostrana.com/48730575569c6ha.pdfIn PDF document text
    • http://pumba.fun/fireworks_sound_effects_wiki1e75m.pdfIn PDF document text
    • http://dovulup.iblogger.org/53592233222.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/ghgjiur/67612742823.pdfIn PDF document text
    • https://zagarete.weebly.com/uploads/1/3/4/6/134687236/zuxifolawi-gidizakek.pdfIn PDF document text
    • https://nabodavovi.weebly.com/uploads/1/3/1/4/131406515/7cf228.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/gfGNTig/free_nursery_rhymes_app_video_offline_songs_mp4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lovopezabima.epizy.com/puwoduw.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/ajax_submit_form_after_validation.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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 5096 bytes
SHA-256: ed2708e7b4c26d10122aa441c5e505cfb8814913a69d18d8eb45be45685608a2
font_01_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 10308 bytes
SHA-256: 83fd69f301f70ec3fbc45782cb06330055c9175c85a195b36f4abbe3fe1bcdf0

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