Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c86912e1c1d382a…

MALICIOUS

PDF

76.5 KB Created: 2021-04-21 15:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 08466e549b4f0d4edd65c2edcaae5340 SHA-1: c43b60c1adf71aeb58134e6eb3d9a79f34bed311 SHA-256: 1c86912e1c1d382a60d51234df25ebb37843f9ed0ca7e6eafb7972b80beff6d4
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. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains a lure related to 'smart board in classroom' and references wkhtmltopdf, suggesting it was generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=how+to+start+smart+board+in+classroom PDF link annotation
    • http://pupezawat.scienceontheweb.net/viratikurupomipawelazodum.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/67107003186.pdfIn PDF document text
    • http://gatorama.site/modelo_contrato_de_arrendamiento_vivienda_colombiar3qgm.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/biomass_energy_engineering.pdfIn PDF document text
    • http://50off.pro/golf_battle_cheats_2020loq61.pdfIn PDF document text
    • http://verification-help.com/joining_letter_after_maternity_leave_templateavjnr.pdfIn PDF document text
    • http://coolstudent.space/carl_sagan_cosmos_chapter_1ezluq.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/jglrDhb/gigalife_smart_netflix.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/calendario_escolar_cyl_2020_19.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/jfjfJjh/27660241978.pdfIn PDF document text
    • http://matrixbicycles.com/pofesigubikijupetezatutug689d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/30550777958.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/killing_eve_season_one_episode_guide.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_a38494d2059f4c8097370cf526e1ddb0.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_6035371e2fb8417198da7bafc0031c27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/how_to_use_external_flash_nikon_d3400.pdfIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_782f1268caf14e728740da06280e3db6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/xebaboxunobujig.pdfIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_6ad87573f644420f9cf6f749c6fd4e47.pdf?index=trueIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_d22076f7f2784f6ea7903d18e4098f90.pdf?index=trueIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_85a004d10d5549e2b8af7ec65e074903.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 5276 bytes
SHA-256: e30eaa79829e63d6b176a458d14798ceb0db54bc082457cc33ee220be3af87ff
font_01_sfnt_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 11200 bytes
SHA-256: 6a34eac5c204a874b6d22ae6e7ed3a6beeac4cdfa08aea7c9477c84fb2607760

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