Malicious PDF — malware analysis report

Static analysis result for SHA-256 491e384cbf1c2c63…

MALICIOUS

PDF

71.3 KB Created: 2021-03-17 15:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22e7b83b0c53be0e72cac80fb79c06fe SHA-1: 7ea2a54abd3f2b70933e4b49ef46e7d43c3d6e57 SHA-256: 491e384cbf1c2c63ebccb450848a3ef300e8ea49e7421a9c244d78dd2f29ec83
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • 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://soxebez.ru/strik?utm_term=used+gas+club+cart+for+sale
    • https://lejalebenepuk.weebly.com/uploads/1/3/0/7/130776022/dunosejo-depafus-fugebatus-sigotidijubovuj.pdf
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/5866838.pdf
    • https://cdn-cms.f-static.net/uploads/4456399/normal_5fea1c50d4657.pdf
    • https://cdn-cms.f-static.net/uploads/4474465/normal_6032e7a345bd4.pdf
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5fd11cae7d32a.pdf
    • https://besukobar.weebly.com/uploads/1/3/1/0/131069863/davotulidozi.pdf
    • https://lofemeraj.weebly.com/uploads/1/3/2/8/132814933/463adb70cfa1.pdf
    • https://nezuzubes.weebly.com/uploads/1/3/5/3/135327702/e388f93967.pdf
    • https://cdn-cms.f-static.net/uploads/4451970/normal_604bc8ace225b.pdf
    • http://xiwezalibo.22web.org/zusopowumubaf.pdf
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/3762915.pdf
    • https://japapetokanov.weebly.com/uploads/1/3/1/4/131454126/8084788.pdf
    • https://begazasageb.weebly.com/uploads/1/3/1/6/131637419/3173612.pdf
    • http://zelaxukixut.iblogger.org/30647531945.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_f0f2d05a47604e69a0e3b29ce923a37e.pdf?index=true
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_9cab130177be44e381cbed0f9d7b063f.pdf?index=true
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_9c63b43226a2418dacd94ca559989d6c.pdf?index=true
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_50105effb0b646c5a52b0ce04c3537e0.pdf?index=true
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_739e4fd46ab64f2c97af297ab591acb6.pdf?index=true
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_9b437417ce0449279acffb0c861c92dd.pdf?index=true
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_75f7bc0e88624c4dae25b9d2060d1e6c.pdf?index=true
    • http://fadirejanebebi.epizy.com/puwobimelikotisomi.pdf
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_15a13bc3e3a245519b75fac92d7cda0c.pdf?index=true
    • http://fodukenama.epizy.com/86479490731.pdf
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_cb0f2b3353334672986453e4456bdc99.pdf?index=true
    • http://suvejosojop.epizy.com/56421893332.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_off0000d83c.bin
dc59d7505c74af88ec09179b9d9fd0eec375147f722fcfdac0c062f4a2aa3eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 5320 bytes
font_01_sfnt_off0000ea61.bin
c3de67f62293e4379eee598419e066efb2ea899aa312eb0872d0215a4647bf46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 10732 bytes

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