Malicious PDF — malware analysis report

Static analysis result for SHA-256 77aa6635625a742d…

MALICIOUS

PDF

78.4 KB Created: 2021-03-31 12:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb480d35562ee2e0a35ece7efb31cde4 SHA-1: d1c9cb2fae3ca57bb3cd9266f04231ba19002d30 SHA-256: 77aa6635625a742d1d5ff74a89011922ea679b23f1d49a188a7d237c4c2e9fda
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many links on low-reputation sites, a common tactic for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=grohe+shower+mixer+valve+parts
    • http://disconto50.pro/bedtime_stories_2000_season_1t16um.pdf
    • http://hairsprof.ru/pottermore_phoenix_patronus_answers5dpkl.pdf
    • http://stavki.link/9265424811epygu.pdf
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/titokojumimugugejeru.pdf
    • http://vclean-sale.shop/zupush086p.pdf
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/bapeg.pdf
    • http://kersita.fun/mental_status_exam_appearance_and_behavior_exampless3llq.pdf
    • https://kosemezaped.weebly.com/uploads/1/3/4/7/134711049/7ce0fad.pdf
    • http://umdtheatre.ru/4370827649784hah.pdf
    • http://byseles.xyz/city_drifters_unblocked04ndx.pdf
    • http://ralugugifoxatir.scienceontheweb.net/bonolota_sen_by_jibanananda_das.pdf
    • http://iciapp.xyz/why_is_economics_important_in_healthcareqt65v.pdf
    • http://xoziduso.mypressonline.com/fotokomeduleg.pdf
    • http://thrivewebs.com/850105600610tudd.pdf
    • https://wobosiwax.weebly.com/uploads/1/3/1/6/131607505/9704681.pdf
    • http://bosemefawixuwov.mypressonline.com/class_9_english_beehive_help_book.pdf
    • http://tunabamilusi.mypressonline.com/blunders_and_brilliancies_free_download.pdf
    • http://manovina.mypressonline.com/vopasuzuvisutaxup.pdf
    • https://jopokiwajisi.weebly.com/uploads/1/3/4/1/134108554/0b8e904d12d.pdf
    • http://mekomob.getenjoyment.net/harry_potter_and_the_chamber_of_secrets_book_bloomsbury.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jemukiguwuw.myartsonline.com/loziramexew.pdf
    • http://zutugidod.onlinewebshop.net/busting_loose_from_the_money_game.pdf
    • http://roxujewov.myartsonline.com/loluposan.pdf
    • http://sulorowanutabu.atwebpages.com/margaret_atwood_poems.pdf
    • http://zuzopejorexa.onlinewebshop.net/billie_jean_fingerstyle_tab.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_off0000f57f.bin
073cfa00b12e92280838e7f44bca8612d6e263cc7e523555f4fec9337421f481		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 5312 bytes
font_01_sfnt_off0001077d.bin
4e1e5609ec0afb4f4357dac8f9fffec94b9f9333c3a4ffdba6dd5e9f61420e57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 10840 bytes

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