Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc035deeefea254…

MALICIOUS

PDF

83.8 KB Created: 2021-03-24 13:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 320f6d529a47332b93f91df508aca57a SHA-1: 45879d5eafbc01428db667db24f2e1ce80b6b2b9 SHA-256: 3fc035deeefea2541028dddf057331f7e1988ed83bf780b67619914b26d13c73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://gimoguvi.ru/strik?utm_term=how+do+you+stretch+a+tight+piriformis+muscle PDF link annotation
    • http://mizizufiku.mywebcommunity.org/single_crochet_stitch_left_handed.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/suwagexuberorokelilozejo.pdfIn PDF document text
    • http://masalev.ru/dollhouse_movie_ratingtf3u2.pdfIn PDF document text
    • http://virona.org/runa_vimochana_narasimha_stotram_mp3z0xqn.pdfIn PDF document text
    • http://kepopuxididavez.22web.org/bezisupezexukuxifesalozur.pdfIn PDF document text
    • http://iglivesupportteam.com/994659522588mqoc.pdfIn PDF document text
    • http://hamsterbig.com/zudivupit7d4h9.pdfIn PDF document text
    • http://216tilford.com/jeppesen_aviation_weather02bpt.pdfIn PDF document text
    • http://vkrowl.com/lodaduvefat8ah8b.pdfIn PDF document text
    • http://vevaroda.scienceontheweb.net/63709028438.pdfIn PDF document text
    • http://tersq.fun/351994746321ie9j.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/10000_reasons_bless_the_lord_chords.pdfIn PDF document text
    • http://exemplpusj.com/linksys_e1500_router5mbkv.pdfIn PDF document text
    • http://b2b-servis.ru/8477671949ifls6.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/past_simple_irregular_verbs_exercises_2_eso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_7e250594904942ccaed48d82a414b6cb.pdf?index=trueIn PDF document text
    • http://molegidotisi.rf.gd/lajosubozalufogofag.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/5258923507.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/quadratic_equations_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/bsc_b._ed_form_online.pdfIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_e042a1e9ab864502b1824c4c193035dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/how_to_change_power_steering_fluid_2011_honda_pilot.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_39c8e244e91e453887450e5405948faf.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_2b55673de0174916817504baa7bd2e5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/introductory_econometrics_5th_edition_solutions.pdfIn PDF document text
    • http://zisifotixevul.rf.gd/wuvenekajoxivagilu.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 5724 bytes
SHA-256: f4b93120be8c69cc507ca63ed2883ec4119e3f523b0ffc48d8d3c6bd645e987a
font_01_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 10944 bytes
SHA-256: 2d36e6f1b1aae9d145142397ea78e8987d36930e26d918aa6dbac3d17899d471
font_02_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 16136 bytes
SHA-256: 4a82d930af4ff3021f3d19cbd37464c8e664c90bef13661c9db69df894853898