Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c272259c63d085f…

MALICIOUS

PDF

79.5 KB Created: 2021-03-27 11:27:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68790a6d145e79f99eb163591d6fb36c SHA-1: 71a2463e932459750a2b8967de5e78b5a739003e SHA-256: 9c272259c63d085fe1deb1938f752d57f954f8faf5ab74aa0c1c6d08f4befb9e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/strik?utm_term=how+to+write+an+article+reading+report
    • http://dojisef.iblogger.org/find_my_mobile_through_android_device_manager.pdf
    • http://biteroz.iblogger.org/beautiful_dolls_pics.pdf
    • http://xezobofelupazat.22web.org/goraninorebuwofodax.pdf
    • http://gasurorir.sportsontheweb.net/16734675495.pdf
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/mukavoforevasuz-kawivuj-pafixojedotu-rejakuvijes.pdf
    • https://xalumalalo.weebly.com/uploads/1/3/4/7/134766869/fupakefuguxuba_birova.pdf
    • http://saripituxupagek.sportsontheweb.net/nuniliwugixivewaze.pdf
    • http://nijuwebil.iblogger.org/55767168103.pdf
    • https://tujuwofaxeg.weebly.com/uploads/1/3/2/8/132814826/ruvafofapewoweboda.pdf
    • https://lafivejazep.weebly.com/uploads/1/3/4/7/134771341/2721152.pdf
    • https://bimuwosexiwo.weebly.com/uploads/1/3/1/1/131164043/tivavekupat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6a66dc8-8767-43a2-a6b4-b1eadccd8965/venn_diagram_math_example_grade_7.pdf
    • https://uploads.strikinglycdn.com/files/0c5eb3cc-7059-43eb-8f58-cf2ddfb4bfa0/the_yellow_wallpaper_full_text.pdf
    • http://xirofapinowud.atwebpages.com/zaneruvibuwarotome.pdf
    • http://vusotinodobofo.rf.gd/vavujafedipoxi.pdf
    • https://s3.amazonaws.com/mipeboro/52820434124.pdf
    • https://s3.amazonaws.com/pazovugal/vuximudufegodofujexolulaw.pdf
    • http://gevejonitu.onlinewebshop.net/elgato_hd60_s_capture_card_setup.pdf
    • http://koxaxinum.epizy.com/bhojpuri_movie_raja_babu_hd.pdf
    • https://uploads.strikinglycdn.com/files/c168a568-79ca-4397-80b5-3fc53ef71050/how_much_does_a_starbucks_worker_make_an_hour.pdf
    • https://uploads.strikinglycdn.com/files/907ea4a1-f31d-4a25-abd3-8fbc9bcee8ed/kaniko.pdf
    • https://s3.amazonaws.com/figidireki/chakra_cleansing_meditation.pdf
    • http://befojarariwowab.epizy.com/canon_eos_digital_photo_professional.pdf
    • https://s3.amazonaws.com/wunojipu/14139631548.pdf
    • http://fovawipemezipu.myartsonline.com/how_to_apply_decals_to_a_motorcycle.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_off0000fa50.bin
620d1da87bcd1a04668de6ae4dd4896234fcbc1816b4d4d1cc8b3d72fc899a4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 5116 bytes
font_01_sfnt_off00010bd4.bin
e02da82296d2cc31fe2cc6c2469bad59ff8b97bfa35cc2d3186ef58f20a5a938		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 10824 bytes

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