Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d3fc7861f530da…

MALICIOUS

PDF

77.9 KB Created: 2021-02-27 04:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ab5704f3639d221e6db25b36febe6f3 SHA-1: 9801297481ab3051c976d423150d55b417151010 SHA-256: f4d3fc7861f530da9513c61bac95d1c0e7772dcb72ad6552ee711a3a81e7010a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms on disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are characteristic of phishing or malware delivery lures.

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://gimoguvi.ru/123?utm_term=5e+phb+feat+list
    • http://bumumapa.mypressonline.com/61080131905.pdf
    • https://static.s123-cdn-static.com/uploads/4424341/normal_5fc60b2ca97c0.pdf
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fdba79520231.pdf
    • https://cdn-cms.f-static.net/uploads/4455642/normal_600f889f9250a.pdf
    • https://ginimowawogob.weebly.com/uploads/1/3/4/7/134753870/1592040.pdf
    • https://static.s123-cdn-static.com/uploads/4375522/normal_5ffe05a3a27ab.pdf
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/49cb341.pdf
    • https://cdn-cms.f-static.net/uploads/4412607/normal_602936d9a256f.pdf
    • http://fojozefamofu.22web.org/gufefivapizokesutifat.pdf
    • http://wisifugapu.22web.org/xewomagafuzaduw.pdf
    • http://vuwefedope.sportsontheweb.net/nintex_workflow_query_list_example.pdf
    • http://bamefidev.mygamesonline.org/rukaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://veguxakafopuvix.epizy.com/geridejurigabidamuma.pdf
    • http://vujapoguxesak.myartsonline.com/motuxagoxujefirunagovu.pdf
    • http://fabibupotiliba.epizy.com/how_to_clean_a_dometic_air_conditioner.pdf
    • http://nabiderafiwo.epizy.com/domogodi.pdf
    • http://zefifimagami.epizy.com/ldc_2018_answer_key_12_august.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_off0000f4bf.bin
5bca428806f7ebe4acf3a6b5f0b005dce4166aca53b8c926ce614cb24619fe0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 5060 bytes
font_01_sfnt_off000105f4.bin
6fdbf19f3a322ce19bdf1ac3ecd69899665b6e31f37e47b79f942705bfe30086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 11208 bytes

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