Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75a39217167d275…

MALICIOUS

PDF

76.9 KB Created: 2021-03-06 09:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b35decb5aabe1412fac96026a4f057a SHA-1: bef806c88b80a0ca40327e035719643cc36d6ccb SHA-256: f75a39217167d275a7696de6a4339177df7582440695c025f57b483c11d1ca1d
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/123?utm_term=how+to+add+ingredients+to+a+bread+machine
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/2842616.pdf
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/tujaxatogev.pdf
    • https://static.s123-cdn-static.com/uploads/4425209/normal_5ff57c0958ae5.pdf
    • https://cdn-cms.f-static.net/uploads/4469374/normal_6022b3019e68f.pdf
    • https://rerararomimin.weebly.com/uploads/1/3/1/3/131383042/12302c6576.pdf
    • https://poxagubojawi.weebly.com/uploads/1/3/1/4/131482812/8746433.pdf
    • https://cdn-cms.f-static.net/uploads/4386595/normal_601ee070084cb.pdf
    • http://neximegimukik.iblogger.org/radozux.pdf
    • https://bifixebuwo.weebly.com/uploads/1/3/0/7/130776276/1552882.pdf
    • https://xesizoge.weebly.com/uploads/1/3/1/4/131452949/zebatosijuf_razuruzuxa.pdf
    • https://wajupinafuju.weebly.com/uploads/1/3/4/7/134752356/4893264.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_5dff77a1771a4574ae734919161fbc44.pdf?index=true
    • http://wedalavunobuwe.rf.gd/vmware_ballooning_performance_impact.pdf
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_e374ff7511634227a0240896a2297757.pdf?index=true
    • https://s3.amazonaws.com/bakoloj/60960464281.pdf
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_87d5340754914ad8af02254be4de5a66.pdf?index=true
    • https://s3.amazonaws.com/lorifawuvawot/dania_beach_surf_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efda.bin
094a9c72ecbb0a365a4493d117443d9469c69dc602552e48f720f7a34bc45028		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 5516 bytes
font_01_sfnt_off0001027c.bin
e884dbe9a9565485f8c80397204b49d2f6eacb6b3aa024d6f9fe21eb70ead635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 10488 bytes

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