Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47ac4b665333433…

MALICIOUS

PDF

76.2 KB Created: 2021-04-26 06:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 56c23a9403ac7e347749f264982c4a36 SHA-1: 72de1030c82cc80643b9735518f2a2d395b40012 SHA-256: e47ac4b6653334336dc013f9e3370a509a058a79029a7c26894d4fe4ed28d576
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body text is heavily obfuscated and contains metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what%2527s+the+best+audio+bible+app In PDF document text
    • http://life50it.pro/aniversario_de_la_constitucin_mexicana_inglsjh9bj.pdfIn PDF document text
    • http://jorowelumupikom.iblogger.org/nozimesadut.pdfIn PDF document text
    • http://chebsvet.ru/brother_mfc-7340_drum_erroruxv93.pdfIn PDF document text
    • http://hookup754.fun/report_elderly_abuse_louisiana3epr4.pdfIn PDF document text
    • http://pudirexuzil.iblogger.org/historia_de_la_iglesia_cristiana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477173/normal_6006474190a71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_606302f89fb2e.pdfIn PDF document text
    • https://cdn.sqhk.co/lifudidu/jhghicB/pixel_gun_battle_royale_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/ibzBjia/new_english_songs_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fcefe83c9904.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_95f153ce8ade458799becc475f34610b.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_e5dd6be7f2a54a8db60a88b955b43f37.pdf?index=trueIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_9bf6b9cbe0ba45daaaff97d78e0f9167.pdf?index=trueIn PDF document text
    • https://041c2bdd-267b-4995-9d72-d071cf2c2b2b.filesusr.com/ugd/ba0b69_0634515a8ca6451c9451ae1c938a1a5e.pdf?index=trueIn PDF document text
    • http://wozadubokurego.epizy.com/how_to_open_viewer_app_in_jio_phone.pdfIn PDF document text
    • http://fowuzubu.rf.gd/jotetukolede.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_5441494dbf0c472686d3db9fc1518a83.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 4916 bytes
SHA-256: b7c64ccfa1ba2db6303334df9ef50177f4a4584c432bb7553904e1afd74b5649
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 11064 bytes
SHA-256: f66266c2608c5107c8a3e042b2ffd0b23171a5d4ed151953bcac8d1c027ac4ab
font_02_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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