Malicious PDF — malware analysis report

Static analysis result for SHA-256 9393c425e8f827b1…

MALICIOUS

PDF

80.3 KB Created: 2021-03-24 10:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79b768fc833b4a7685578228bb8d6e6f SHA-1: 7fd755406fa2b6eb76128be78a092bad30652233 SHA-256: 9393c425e8f827b18c89f8cee332f8c7bd604c6e17d287cc76019ae5d39676b0
126 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to academic citation, which is a common tactic for phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a strong intent to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://botokaw.ru/strik?utm_term=how+to+cite+sources+in+mla+research+paper
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/5736766.pdf
    • https://static.s123-cdn-static.com/uploads/4418764/normal_5ff4eedfeb4a9.pdf
    • http://onenature.space/learning_spanish_like_crazy5en0f.pdf
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/nuvojedikezadunuwidu.pdf
    • https://fipamexi.weebly.com/uploads/1/3/1/4/131407823/f273cb71f08d.pdf
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/karipivi.pdf
    • http://cheapkeys.site/mp3_pocket_rocket_free_downloadzlqmm.pdf
    • http://ketotreno.buzz/701651382331rz99.pdf
    • https://cdn-cms.f-static.net/uploads/4445866/normal_601f13581a8b3.pdf
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5fd8598642702.pdf
    • https://molisepav.weebly.com/uploads/1/3/5/3/135347716/4299565.pdf
    • https://cdn-cms.f-static.net/uploads/4468814/normal_601fb6d394fe0.pdf
    • https://wesonibisizigoj.weebly.com/uploads/1/3/0/9/130969529/pujezuto.pdf
    • https://static.s123-cdn-static.com/uploads/4471958/normal_5fccf4cb5a579.pdf
    • http://islta.fun/xinireuesys.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/627adf62-570f-43f1-9602-707b6aafebb3/why_is_my_traxxas_transmitter_blinking_red.pdf
    • https://uploads.strikinglycdn.com/files/f7a13513-11a6-46d3-a08b-2d2d8ec203a7/zeteredasiwanodomox.pdf
    • https://s3.amazonaws.com/mogedozara/18183039770.pdf
    • https://s3.amazonaws.com/godoremitiwuja/mudadomulefidatigiwadef.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/el_pollo_loco_menu_sides.pdf
    • https://s3.amazonaws.com/folexapurilowe/41498551610.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefb.bin
ee46a2f8418dafaf2cae685d8ed47056a8cb7bd0e065757056096fc4cabca529		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 5108 bytes
font_01_sfnt_off0001002f.bin
6dab388c152030c4a35a0114926914853ae773455683dd2ab387ce9d2f93f3e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 10484 bytes
font_02_sfnt_off000123f8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123F8 4324 bytes

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