Malicious PDF — malware analysis report

Static analysis result for SHA-256 c380df66947cbc64…

MALICIOUS

PDF

76.6 KB Created: 2021-02-19 23:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0bf454c3a5edbd4b97a23e732229e061 SHA-1: eece678d80e020dc254d9bc8dfa7aaa4d8e78f6a SHA-256: c380df66947cbc645f61054dd588b3c1f84f073f75e0727c3ab87eac038afb7b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to potentially malicious websites. No scripts were extracted, but the overall structure and URL patterns point towards 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://bologen.ru/123?utm_term=hcg+2.0+drops PDF link annotation
    • https://cdn.sqhk.co/wubunepan/fahgjgy/80339371040.pdfIn PDF document text
    • http://grantmedica.ru/different_types_of_communication_channelsi2elk.pdfIn PDF document text
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/konovomajov_begonet_neponisesulepog.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/iajajeL/minecraft_live_2020_mob.pdfIn PDF document text
    • http://adyga.site/dragon_quest_11_character_skill_guidets968.pdfIn PDF document text
    • https://popewike.weebly.com/uploads/1/3/1/4/131407195/sepupubavud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_601ec22cf10dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_5fd8c90a29078.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499995/normal_60034fb285dc5.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/7058775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491673/normal_5fedf7c12fcc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/62103061551.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_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 5264 bytes
SHA-256: 05c653d1b21801b9a308f19727073a01d661d8ecf74f0464e2b6de3b32b56e61
font_01_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 10476 bytes
SHA-256: 8590896bc9a2162b9773e37a06bd748c1ed4b31e43db47218aad16b54d8b03f4

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