Malicious PDF — malware analysis report

Static analysis result for SHA-256 af73553ca54573f0…

MALICIOUS

PDF

83.1 KB Created: 2021-04-16 15:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 688728b23664c72fce669c017015ea47 SHA-1: 202887f195f9a216e2c85b39bec68b441655bd2f SHA-256: af73553ca54573f078af98d39672247c9df13d780b1d9f7d29448a726787bbb2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to redirect users. The primary malicious URL identified is 'https://gimoguvi.ru/strik?utm_term=why+are+behringer+synths+so+cheap', which is likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

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/strik?utm_term=why+are+behringer+synths+so+cheap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365570/normal_602a3386c13ba.pdfIn PDF document text
    • https://bugevokugado.weebly.com/uploads/1/3/4/8/134870551/2742431.pdfIn PDF document text
    • http://susurrus.space/dopagew8s3.pdfIn PDF document text
    • https://lidoporovumo.weebly.com/uploads/1/3/4/5/134506542/6427743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5ffe427ef1823.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/1524897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_604d0b2ea847a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fd65fdb691e9.pdfIn PDF document text
    • http://edalovert.xyz/interior_design_colleges_in_pune_symbiosism29am.pdfIn PDF document text
    • https://raxabebawozovi.weebly.com/uploads/1/3/4/3/134311701/movemesevana-kazomofi-vonebu-bawodunolumabo.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/webipejonavuv/tijufekuxonanaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/online_work_timesheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28f94cb-a0d6-4d64-b474-f46464bc2cc1/pifajipobawetedelopufof.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/90436353479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa8331b-3d65-4069-be0f-8c8f6f02b4a4/after_book_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340165a1-7ee1-4373-a89c-989a22cec997/define_tribe_in_sociology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69714bbc-991a-4f99-8b33-40e336511894/59634738753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b19d169-9d8a-40d4-a510-b9ea87fb3fa8/96627247693.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 5204 bytes
SHA-256: 5e0b38b40e92adbea9fb49121832c0263201522bb7eccf32599b361799e475ab
font_01_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 10928 bytes
SHA-256: 2c08039de4deed984cabdcd39b12c481ce9f82b27266acdce880cfe0a33c5c47
font_02_sfnt_off00012fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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