Malicious PDF — malware analysis report

Static analysis result for SHA-256 751db8b9e5f92816…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 08:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ba40e035b7be7856495d83c67401d7cc SHA-1: 39e0d2c9f22dde9048f7b2e4e8c146aec658a6b8 SHA-256: 751db8b9e5f928163a2bfa4cee1d8dddb465c1e58c647601cc1a3734da1c4448
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to game downloads, reinforcing the lure.

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://botokaw.ru/strik?utm_term=candy+crush+soda+torrent PDF link annotation
    • http://lezeninimi.medianewsonline.com/what_does_the_term_brown_bear_mean.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/62606108228.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/WHgjjdS/offline_games_for_windows_7_download.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/xewoxakikanorojo.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/finite_element_analysis_truss_matlab.pdfIn PDF document text
    • http://lorenbayi.com/21389341664iv9ar.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/fha8jd1/stickman_battle_online_shooter_3d_mod_apk.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/vagodajulavasizigovo.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/be1baf9644bc2d8.pdfIn PDF document text
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/sotilibepasone.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/2gQUEEt/led_programmable_light_switch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://godavuvexo.epizy.com/zovup.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/51491518711.pdfIn PDF document text
    • http://fakeloj.rf.gd/zaparozaf.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/how_to_use_ryobi_miter_saw_stand.pdfIn PDF document text
    • http://zekakodususebu.epizy.com/after_effects_project_free_sites.pdfIn PDF document text
    • http://jojisoxig.epizy.com/85928703708.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 5004 bytes
SHA-256: 90d5a6af10a4a30058c481e20dc2299b3b5ed9ada6a1eb814c9db0b39467dbe8
font_01_sfnt_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 11312 bytes
SHA-256: e3fcab58f550d17fd894d018810c3a3b44be2caa1cd01ffc71b39c5c795cf643

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