Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b21a417583e1ef…

MALICIOUS

PDF

72.4 KB Created: 2021-03-11 17:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9599bc94baf2a15111c57a85f9787b1 SHA-1: e345d036e7b92fb6f79a26a56775b3a17dbca76e SHA-256: e5b21a417583e1ef0543fc1a03fac16829ead9670cfa29072d8d175a6b193d77
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though garbled, contains a search query, reinforcing the phishing 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://vilenefex.ru/strik?utm_term=how+many+calories+in+a+10+inch+margherita+pizza
    • https://cdn-cms.f-static.net/uploads/4420907/normal_6009eb793779e.pdf
    • http://rizuxikasosokeg.22web.org/pixezigowibabidujifanali.pdf
    • http://presentinsta.online/honkai_impact_3_mod_apk_2.5_0blebt.pdf
    • http://espaceabonnes.com/kjv_bible_study_lessonshze2t.pdf
    • https://cdn.sqhk.co/wofetewa/jVdhf1y/ascend_performance_materials_decatur_plant.pdf
    • http://100p-f.ru/mainstays_parsons_cubby_tv_stand_instructionso2pkc.pdf
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5fdb93280c408.pdf
    • http://kieverts.xyz/nenax5g6dh.pdf
    • http://invitesistem.ru/kokosutalaa9qkh.pdf
    • https://lomewulepizava.weebly.com/uploads/1/3/3/9/133999744/tutemudawom.pdf
    • http://jigatinapa.22web.org/lirogupelenok.pdf
    • https://cdn-cms.f-static.net/uploads/4393889/normal_6039aab20173e.pdf
    • https://tavutafaj.weebly.com/uploads/1/3/1/4/131482866/bc397886c.pdf
    • https://cdn-cms.f-static.net/uploads/4481282/normal_602d05c64580f.pdf
    • https://cdn.sqhk.co/lapefuxolu/eQijhf8/3607789204.pdf
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5fe8faf918b67.pdf
    • https://tizonitiwu.weebly.com/uploads/1/3/4/7/134734793/2450456.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rerinago/valujojegafosivututurod.pdf
    • https://s3.amazonaws.com/kabisebax/alfreds_basic_piano_library_lesson_book_level_2.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/klm_delayed_baggage_report.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_off0000da9c.bin
fdb5d18864ecfa0bf2561a9476956eb345d03d0edccc69e2a1d66418130116b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 5748 bytes
font_01_sfnt_off0000ee1e.bin
61c865c6c20647cbcb476547640f9b22dc3540f6c66d66a6c95303801ea1a262		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 11204 bytes

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