Malicious PDF — malware analysis report

Static analysis result for SHA-256 83114eacfebb3415…

MALICIOUS

PDF

74.4 KB Created: 2021-03-10 06:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a75294e7fe4549eefe5791014f63e48 SHA-1: 9bd93241d41237f9d117406a65cd59b8edbd21eb SHA-256: 83114eacfebb341560d714587063b707ee28cc4052dfbac9d26185aa1a158fd5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/aws?utm_term=ereading+worksheets+text+structure+quiz
    • http://gifozuxozud.22web.org/pepidojuwomuz.pdf
    • https://static.s123-cdn-static.com/uploads/4481069/normal_5ff2cbc83f70d.pdf
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fe9cf9937fad.pdf
    • https://cdn-cms.f-static.net/uploads/4366034/normal_601fa9c0d584d.pdf
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/dobenuwara.pdf
    • http://zubiki.top/ratofibiwuperxo8fb.pdf
    • http://tamazilewuviden.22web.org/how_to_use_neato_d7.pdf
    • http://about-central.com/fewewebiwamiwusobyza6l.pdf
    • http://dihtyar.online/32596325287byslh.pdf
    • https://vuvogotekepuma.weebly.com/uploads/1/3/0/7/130776629/f348e69540f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_57c53bf2721a442883c0c6f2b8b75a4e.pdf?index=true
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_f99694dd8ace486f8f208210cba0f38d.pdf?index=true
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_a2ddc31639e946bf86665627af653e57.pdf?index=true
    • http://lumaxixi.epizy.com/wipal.pdf
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_0f8f05ca43ed46a9a3ff0ef2acdd3baa.pdf?index=true
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_c3d94d50c1a144a6a7b982c2947675e9.pdf?index=true
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_e43bd291ff104ad9b6c80615426dfd9a.pdf?index=true
    • http://dawutanarav.epizy.com/total_conquest_apk_mod_unlimited_gold_apple.pdf
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_f720e57b06a24016a6c706fb2521a665.pdf?index=true
    • http://heniss.pbworks.com/w/file/104007381/understand
    • 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_off0000e519.bin
c62f486324abc8524c6857ac155ce8d1ed1b7c26813dc41d1dc1088d1a91d49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 5528 bytes
font_01_sfnt_off0000f7fd.bin
b4b22714f1803c44aff369950577ee3c1c851ee6700c787808368c1612559d12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 10664 bytes

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