Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb07859890d4b2c3…

MALICIOUS

PDF

85.6 KB Created: 2021-03-22 21:35:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 549363d478e46a44020c466eb46f1d1e SHA-1: 950d9cfe08f7b9f933c2e8b3033d494160318c4c SHA-256: fb07859890d4b2c3b295adf4aa532df92c21b59387a95f079a4bd2ec2102abbe
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting a link farm used for SEO poisoning or to host malicious content. The primary external URI points to 'zajinet.ru', which is likely a malicious domain used to host a phishing page or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=what+is+breathing+technique
    • https://cdn.sqhk.co/sovokeduseb/jCnhijc/gorag.pdf
    • https://garanokuwepo.weebly.com/uploads/1/3/0/8/130874617/99d5b09b4.pdf
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/4660914.pdf
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/8227543.pdf
    • https://cdn.sqhk.co/marezotije/gjcVicf/69162020247.pdf
    • http://maturibcgj.space/sprawl_trilogy_epublye17.pdf
    • http://balifruit.com/54281150885ch9xc.pdf
    • https://cdn.sqhk.co/mabisurud/nhbsZgd/doomsday_mom_cult_case.pdf
    • https://cdn.sqhk.co/lenubire/VjcTI2A/37990740903.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wexukufedepim/futowi.pdf
    • https://s3.amazonaws.com/belapawerezuju/xasokidetukevalubenat.pdf
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_5fb3e10034a64cf2b37536625e76da5f.pdf?index=true
    • https://s3.amazonaws.com/mosezavor/how_to_draw_easy_things_for_beginners.pdf
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_cc85beef61024f81ab83cb322b495542.pdf?index=true
    • https://s3.amazonaws.com/tosego/anime_slayer_apk_ios.pdf
    • https://14579757-8399-40ae-9aa0-1c510f02119b.filesusr.com/ugd/5613ee_73faf1b6fc5642099130be6ed21a7fb3.pdf?index=true
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_c3279ccd08b442a7851b2384123c890b.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_off00010470.bin
5a1dcd178fba24be4d60fafd67f82acee580a63881d4a120351e5cae13eb9de8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 5080 bytes
font_01_sfnt_off000115b2.bin
b2d1663b5f821a92d0f3227f69d8a2f827342395776277a205a011aa3c8d25b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 10608 bytes
font_02_sfnt_off00013a05.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A05 4324 bytes

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