Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a499e0c5704e18e…

MALICIOUS

PDF

77.4 KB Created: 2021-03-16 17:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d2d7ed265a50c3ca596a6f1cee2c078 SHA-1: 6c47e7d979cf10e807cc78d1a7624dd0981e26ab SHA-256: 6a499e0c5704e18eb27539ce83dbab6c3618dfaedff0447b18daa2c0f938faa4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. One of the primary URLs, https://bologen.ru/strik?utm_term=what+is+foils+literary+device, is flagged as unknown reputation, while others are confirmed benign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=what+is+foils+literary+device
    • https://static.s123-cdn-static.com/uploads/4481270/normal_5fcd83753ad38.pdf
    • https://cdn-cms.f-static.net/uploads/4413240/normal_604a1aa0d8c6d.pdf
    • https://cdn-cms.f-static.net/uploads/4425227/normal_6019237a7951e.pdf
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/zukazi_gumumon_lawikegopuf.pdf
    • https://zuxivojeduzudog.weebly.com/uploads/1/3/1/3/131381782/60050.pdf
    • https://cdn-cms.f-static.net/uploads/4391013/normal_6044766906d40.pdf
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/597eeed6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_bfb122b5346e47a0a17c5c776cec5357.pdf?index=true
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_cebed9447c6b45c7a5f17e0371b6a066.pdf?index=true
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_d717bb70ab8b48ccba36bbc76d7caa17.pdf?index=true
    • https://s3.amazonaws.com/zerejibixupav/77675163043.pdf
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_c0a8749d63954a9282611916bcb86366.pdf?index=true
    • https://s3.amazonaws.com/nutanigonu/honda_shadow_vt1100c.pdf
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_ec0e8ca9913c49b7a9384f717cc8fbf2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/774d30b0-c65c-4f4c-84cd-5c87dc98a272/1991_craftsman_gt6000_specs.pdf
    • https://s3.amazonaws.com/kosamupim/commas_in_lists_worksheet_ks2.pdf
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_f42dc77da63a469b9a8687f0af2aeb26.pdf?index=true
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_4748936dd3134e9daefb8726ac180165.pdf?index=true
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_024d3f7eb16b419f8a9fc1f69eb8a1ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f1cc5952-f9f0-465e-85ce-2425e8e12331/77547830214.pdf
    • https://s3.amazonaws.com/mefadedosuw/65477965273.pdf
    • https://s3.amazonaws.com/xufujofaleki/xusano.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_off0000efaf.bin
4046c029a1ec15453dcb570e5f9b796ef7fb347ff6026bec59d921597bbd6cf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 5284 bytes
font_01_sfnt_off000101bd.bin
776db7072f5e62dbe27510bc16c5d4732784a2a739e35caeb78e234568211bd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 11608 bytes

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