Malicious PDF — malware analysis report

Static analysis result for SHA-256 b131beb3c356b23d…

MALICIOUS

PDF

76.9 KB Created: 2021-03-12 16:25:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 71427d7f6bd26c3eda956f5a5d569a8d SHA-1: 82e0a02b0572493f1ba068189bae99fe5e6a9384 SHA-256: b131beb3c356b23d73d560fa863abf0bc622dc6af21acdf60aa63dd6dc652b04
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that redirect to link farms and disposable hosting, suggesting an attempt to obfuscate the final malicious destination. The document body, though heavily obfuscated, appears to be a lure related to a 'Walgreens mini temple digital thermometer manual'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/wix?keyword=walgreens+mini+temple+digital+thermometer+manual PDF link annotation
    • http://zugapuvu.mywebcommunity.org/chamberlain_universal_remote_genie_intellicode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_602a2a4f5ce2d.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/pugugesexowujowuvin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_5fdd6ea74afc0.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/1gdii9h/space_program_tribe_called_quest.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367000/normal_5ff65c1159d7f.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/gh5jajg/how_to_get_master_assassin_armor_in_revelations.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/eK3B2hg/captions_for_instagram_and_facebook_photos_2020.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/96209673734.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/canon_pixma_mp160_driver_windows_8_64_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/pewovixosafu/gefGigD/world_war_ii_fps_shooting_heroes_of_warsaw.pdfIn PDF document text
    • https://zomereke.weebly.com/uploads/1/3/5/3/135397468/naporuxipoja-zaridixeta-sudotuwuxaf.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/dhigiw1/escape_the_prison_game_henry_stickman.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/663b70f6f6f39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_5fd33ab74645c.pdfIn PDF document text
    • https://sovipepunufo.weebly.com/uploads/1/3/5/4/135400675/moparugifulevakunuv.pdfIn PDF document text
    • https://wiluxuvofox.weebly.com/uploads/1/3/0/9/130969019/bonaxafowusasifo.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/is_the_sat_black_book_good.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_604712e1da2a1.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/gezetega/44001778567.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/fakebif.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/airplane_mechanic_salary_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/4103533067.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/shark_navigator_lift_away_professional_vs_deluxe.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/addition_properties_worksheets.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 5384 bytes
SHA-256: 87d7f86d023c356d60d16c36a328867291559f6da743582464638508d50b9685
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 11260 bytes
SHA-256: ac185c53a1650607eb05764edbc8f8e99646a248f2ac149838593a02ffde4747