Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1ba694c7f8eae4…

MALICIOUS

PDF

92.7 KB Created: 2020-12-25 07:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f3b11a42c8ca84f389ebac49f0fd261c SHA-1: 73d705c8f316be71b15785555491bc7785502b1f SHA-256: 4c1ba694c7f8eae47e1f42fc4a1f8cafa10a6998d81c677d5cc4f1bdc5c59f67
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services and employing UTM parameters, indicative of a link farm designed to redirect users. ClamAV and ML heuristics confirm its malicious nature, specifically flagging it as a phishing or trojan variant. The presence of embedded URLs and the overall structure strongly suggest this PDF is used to lure victims to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=arkham+horror+card+game+investigators+rankings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485310/normal_5fd61dee2ac7a.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/1177221.pdfIn PDF document text
    • https://wavutokemik.weebly.com/uploads/1/3/4/3/134309613/bf3c3fc4d.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/fufokaguso.pdfIn PDF document text
    • https://laxedojopepab.weebly.com/uploads/1/3/4/8/134896069/misaveku-sokenapip-pikajuwamanu-fibapajuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5f920754aecc3.pdfIn PDF document text
    • https://gulijigomun.weebly.com/uploads/1/3/4/3/134350957/xamor_tozuxamigimijed_kalumedobana.pdfIn PDF document text
    • https://puvavijage.weebly.com/uploads/1/3/4/4/134461845/3439009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497110/normal_5fb36a66de955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_5fd1e6436fe37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5f9b44c24e09e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fomaralunex/32445022134.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/biotecnologia_agricola_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3dca1c4-ed47-4ce8-a19f-8b7b81189589/99562555166.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 5224 bytes
SHA-256: d16ec94594125b7f6fd32975a5564fc19261911eefeffdd6fb928fc5bbf1b67c
font_01_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 10392 bytes
SHA-256: 5ee444b5a6d8fb983ccfb4197728af738b7b0ba3b1a2d3137e77adaf65716baa
font_02_sfnt_off0001177f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177F 10560 bytes
SHA-256: 56be412c69a0dd6f30300fe17eac4aef2a372613d20e5ae4faf0365b3cc0ca9b
font_03_sfnt_off00013bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDE 19092 bytes
SHA-256: 3a35eaa587477347bea127763aeeab75156c96436fe1992a9bb73317abcde5ce
font_04_sfnt_off0001564a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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