Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace3c6047a9ac15a…

MALICIOUS

PDF

87.1 KB Created: 2021-03-15 03:32:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9c448fc8782c238021ecfd7c1a6cddd SHA-1: 716e618f38d11c8181f8fa9b281e12d5e5100799 SHA-256: ace3c6047a9ac15a90490749a66a8d3ae1068ead10ddf8b38f4019384065a636
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. It contains numerous external URLs, including one pointing to 'bologen.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=job+stress+scale+pdf
    • https://cdn-cms.f-static.net/uploads/4417543/normal_601173a585558.pdf
    • https://vuwadano.weebly.com/uploads/1/3/4/3/134350870/ba9b194d9d7047.pdf
    • https://cdn.sqhk.co/tipusuzog/6hdcihd/dead_ahead_zombie_warfare_cheats_ios.pdf
    • https://cdn.sqhk.co/neguvobipa/Jhejfq1/47290297311.pdf
    • https://cdn-cms.f-static.net/uploads/4451230/normal_6049d577012c6.pdf
    • https://cdn.sqhk.co/teganipuputu/gg8xheb/56249361451.pdf
    • https://cdn.sqhk.co/rowofabuf/bDhigek/colouring_sheets_back_to_school.pdf
    • https://cdn.sqhk.co/moranunemuk/ZggibM4/lukijuxor.pdf
    • https://cdn.sqhk.co/bodorosuzuta/fhigcia/asteroid_war_freestyle.pdf
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/tukinomixiburixafeme.pdf
    • https://cdn-cms.f-static.net/uploads/4501791/normal_5fe710127e0d5.pdf
    • https://cdn.sqhk.co/rejiwosujupa/QsIgj30/helicopter_rides_nashville.pdf
    • https://cdn.sqhk.co/polidupokasu/7CihYif/92618901784.pdf
    • https://podinelejuwe.weebly.com/uploads/1/3/2/7/132710627/geximenezimu_jefab.pdf
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/belesonomed-gonebizipa.pdf
    • https://torififaw.weebly.com/uploads/1/3/4/6/134690130/385aa7dffd56a4c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_21fc823b7ed04d5cbc069020d4afa67a.pdf?index=true
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_a9c8ab97350a49a88e7c255be5fd38fe.pdf?index=true
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_bb28763e9b314b55ac737ed658ef9443.pdf?index=true
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_1b9133cf341a4f4d8119dc9df380c4c1.pdf?index=true
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_f24c60d25c954a259b41bed633f92fb1.pdf?index=true
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_13b3ba1aa8084e48b81aed2af837ca40.pdf?index=true
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_c16424b53eef43c288d0b608faaeb766.pdf?index=true
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_401b7cbc6dfb4ca79cddd17f7337cb75.pdf?index=true
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_fa6d7c0571db47f089c3a948ba1e3a0f.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b60.bin
c2debe79a9ac1d7ee3a52da99fd53088539633f0270523bbdfb0b71ef0f3fd96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 4912 bytes
font_01_sfnt_off00011c1b.bin
4ed434a740515f6905f0661fc3b7ef67726514d5a0dd2de47daae5682232ff02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 10736 bytes
font_02_sfnt_off000140a5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140A5 4324 bytes

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