Malicious PDF — malware analysis report

Static analysis result for SHA-256 143ba1e17e4c237b…

MALICIOUS

PDF

77.9 KB Created: 2021-05-06 22:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1c637788de7c130f888254032fdba6b SHA-1: b0f9b3e2a60c44dfd98b925e20fd9371068f710c SHA-256: 143ba1e17e4c237b5b2d2ece703bd216cb828e974ec4b72093e154f42c9a7912
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, with at least one, https://vilenefex.ru/strik?utm_term=how+to+graph+on+ti+83+plus+ce, appearing to be part of a phishing or malware distribution scheme disguised as a graphing calculator resource. The document's structure and numerous links suggest it functions as a link farm to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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+to+graph+on+ti+83+plus+ce
    • http://nitodizej.22web.org/old_school_cars_for_sale_in_houston_tx.pdf
    • http://jiteruruw.sportsontheweb.net/bhagavad_gita_quotes_on_love_in_tamil.pdf
    • https://jaxevilin.weebly.com/uploads/1/3/1/6/131606955/2f26362c2b.pdf
    • https://kovexinuzik.weebly.com/uploads/1/3/0/8/130815277/fbad6a3d1f380.pdf
    • http://penafur.scienceontheweb.net/68466691375.pdf
    • http://sizuxofutitarax.mypressonline.com/pokajisozul.pdf
    • http://fezelegafefuv.mywebcommunity.org/bsa_kayaking_merit_badge_pamphlet.pdf
    • https://donimafu.weebly.com/uploads/1/3/5/3/135395233/fafofarovolini.pdf
    • http://fejavodexata.getenjoyment.net/buvipobonasola.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zimopup.myartsonline.com/links_awakening_turtle_rock_keys.pdf
    • http://fiforeru.atwebpages.com/folezisef.pdf
    • http://baxudoxubalafe.epizy.com/28969940745.pdf
    • http://zogakule.rf.gd/water_cycle_worksheet_for_grade_2.pdf
    • https://uploads.strikinglycdn.com/files/cac7fe82-5d14-4919-8875-fd6f1fd843e3/82154204828.pdf
    • https://uploads.strikinglycdn.com/files/3ee71e57-423d-4958-9922-8a22542bb201/fosilugadavefo.pdf
    • https://uploads.strikinglycdn.com/files/f00e8019-9e70-484b-affa-45bb29a65718/13655935847.pdf
    • https://s3.amazonaws.com/dudurat/purpose_driven_life_day_14_reflection.pdf
    • http://lazuletezofik.onlinewebshop.net/duzatuwagetupasabober.pdf
    • http://rajasoxavilal.rf.gd/animation_software_for_pc_2d.pdf
    • https://s3.amazonaws.com/jevedijadiki/icingaweb2_graphite_templates.pdf
    • https://uploads.strikinglycdn.com/files/9b7c7c54-f3f3-4f15-805d-78d24d5b6f07/how_to_cancel_my_planet_fitness_subscription.pdf
    • http://xekamala.epizy.com/the_grinch_who_stole_christmas_poem.pdf
    • https://s3.amazonaws.com/zoluwivebiro/papuxurug.pdf
    • http://kejagabato.myartsonline.com/ac_technician_resume_format.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_off0000eeda.bin
132eb2b8e28347dc7165545a81d7d13bcb38e289a50ac450456714b7d0487fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 5604 bytes
font_01_sfnt_off000101fb.bin
44673e997b801796ee7f83422d89c984122a1901d6699fb8659c9db7aff12768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 11588 bytes

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