Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88d2b4baeb681d0…

MALICIOUS

PDF

77.1 KB Created: 2021-03-25 16:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: daeba38b43a7225b0de150b34a181cf1 SHA-1: 0fd8d65451fcc03c6686dd91f4d91b9cd9872249 SHA-256: b88d2b4baeb681d08f67c48f7753785e3a4c9141cbfc8bbf167db500888c9c8e
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to 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 embedded URL and the document body's reference to a 'paperwork reduction act guide' serve as a lure to encourage clicks on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=paperwork+reduction+act+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460251/normal_6035683446416.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/silewasesel.pdfIn PDF document text
    • https://cdn.sqhk.co/bigokukanuf/fgdMojg/ikea_cyber_monday_coupon_code.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488569/normal_6008d56b558de.pdfIn PDF document text
    • http://jajeredax.22web.org/free_printable_letter_s_worksheets_for_kindergarten.pdfIn PDF document text
    • http://fosonelotila.medianewsonline.com/rumilonexojenuvajanada.pdfIn PDF document text
    • https://cdn.sqhk.co/foxenikap/Yvijcbo/bazz_song_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/hhjyq42/monster_jam_steel_titans_cheats_ps4.pdfIn PDF document text
    • http://logefekur.22web.org/95886319155.pdfIn PDF document text
    • https://cdn.sqhk.co/dojaxeje/Riahgjd/44576636980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_6015f4a3452c3.pdfIn PDF document text
    • http://getepitisux.mywebcommunity.org/campbell_biology_11th_edition_test_bank_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/FYMjiXn/donawuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474462/normal_5fcf0ae0e2909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_3b20ffed0e1c46f7850a6d20de0eddcf.pdf?index=trueIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_2e5d925a3e8245e38e88a6a5f0f72a22.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_e73df73ccb194b6682dd86ac5b61cea5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/8915517965.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/91421823911.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_f51fc5ba97ce41a790df6e864357a829.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/el_mundo_de_sofia_jostein_gaarder.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_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 5188 bytes
SHA-256: a7b28cc03225987fabda1758519a6496a1d788cd18ae653e57e3b7c324d370d9
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 11444 bytes
SHA-256: 2d5f294a99597d1338dd80e5d4095da340ee91bc5c380a220110cd2947622c00

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