Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c2e4337f57b983…

MALICIOUS

PDF

108.5 KB Created: 2021-03-26 09:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2fc4afe2e428c6a88a480e1fcd13e75 SHA-1: 93cb09209a03a66d5a24ae2c8c4b5376f44c6b21 SHA-256: b6c2e4337f57b9838297ef8799599ea0f0e5495f8f850a2fd56a95dc9a2f78cc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and flagged as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/wix?keyword=bentley+sly+cooper+voice
    • http://lnstagram-help-businesss.com/72210395942dkxs8.pdf
    • http://gbo.guru/71457174414tfbfy.pdf
    • http://temilops.xyz/scottish_highlander_crossword_answerpzrih.pdf
    • https://vivexizakodol.weebly.com/uploads/1/3/1/4/131483194/93663.pdf
    • http://mybiol.site/8013671705fv89p.pdf
    • http://tamakar.xyz/in_ice_cold_blood_episode_guidet0ime.pdf
    • https://cdn-cms.f-static.net/uploads/4428342/normal_602d08dc6dc28.pdf
    • https://fezuliba.weebly.com/uploads/1/3/6/0/136056139/568802.pdf
    • https://static.s123-cdn-static.com/uploads/4409801/normal_5fde7363f38e3.pdf
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/2853806.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_6036e0e0d5f16.pdf
    • https://ludexibof.weebly.com/uploads/1/3/4/6/134638297/cefba.pdf
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/4543932.pdf
    • http://idealslim-ordina.site/sufasimorefev8d7d7.pdf
    • http://tikanaw.mypressonline.com/69570148610.pdf
    • http://f13x.xyz/samiran_das_baul_gaan_video_song4vfd1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://folilef.rf.gd/game_blade_2_android_apk.pdf
    • http://jurizamumi.myartsonline.com/43049449268.pdf
    • http://xazemonubof.epizy.com/95725223487.pdf
    • http://baritobaseben.epizy.com/calentador_de_agua_solar_casero_con_botellas.pdf
    • http://luvetux.myartsonline.com/payoff_in_statistics.pdf
    • http://fijudixisofuzat.rf.gd/odc_full_form_in_hotel_management.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_off00016d40.bin
5eb095a2b69de58b15881a6dd39788706d4249227b1634433c17b2c5b49da85d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D40 4928 bytes
font_01_sfnt_off00017e2d.bin
b4f972a96e40f0e1e63246cbbd2657cd12f7fef2ae215dd25a58c1c163cb7d09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E2D 10772 bytes

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