Malicious PDF — malware analysis report

Static analysis result for SHA-256 67daecaf0fedcdfd…

MALICIOUS

PDF

74.8 KB Created: 2021-06-11 05:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 194447551b95ac37daa021515a3b55fc SHA-1: 18870317fa919c7a39d2572f054079b4f121a336 SHA-256: 67daecaf0fedcdfd545460355dfa5dc40a5aa728de9f4c87719f527c445c797d
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, with the primary one being 'https://ketchas.ru/pbw?utm_term=who+is+the+world+top+10+richest+man', suggesting a phishing lure related to wealth. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to appear as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/pbw?utm_term=who+is+the+world+top+10+richest+man PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502464/normal_60383bb0bd2bf.pdfIn PDF document text
    • https://jelujelaxaku.weebly.com/uploads/1/3/4/8/134894726/motezur-moduvijadelef-gasezodowezopot.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/2943cb2c09083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_606d5a2a08dd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454306/normal_6031259f919c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_60262f1cc5004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gulisapil.pbworks.com/f/83297691246.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/comparing_paleolithic_and_neolithic_eras_worksheet_answers_key.pdfIn PDF document text
    • http://mogulobobis.pbworks.com/w/file/fetch/144496071/dimensional_analysis_problems_worksheet_answers_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49e44fc-6dd3-4bb3-884a-89e2427199fa/35208378649.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/w/file/fetch/144514845/jj_keller_tractor_trailer_driver_training_manual_answer_key.pdfIn PDF document text
    • http://zoririlebo.pbworks.com/f/18687410594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8249f823-8623-4547-9eca-62db080bb6dd/jopokaladobazax.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/28347125782.pdfIn PDF document text
    • http://depowota.pbworks.com/w/file/fetch/144862089/tarabi_namaz_dua_bangla.pdfIn PDF document text
    • http://veposasidot.pbworks.com/f/cours_danglais_pour_les_dbutants.pdfIn PDF document text
    • http://fobimexus.pbworks.com/f/sibalirij.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144736056/dibonevuja.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/tuxenurozumizogopar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf79b65-fb75-46d1-9ccf-49c10e84ae29/how_to_test_if_your_hot_water_heater_is_getting_power.pdfIn PDF document text
    • http://lerepaxa.pbworks.com/f/decoracion_con_globos_para_fiestas_infantiles_sencillas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2abacc1c-a907-45dd-9924-69a244545cc9/kobokisapo.pdfIn 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_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 5612 bytes
SHA-256: e04254e11528a2b247413bb8938da63beedc6f1fc4e54d2914221d4fc94ef15a
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 11156 bytes
SHA-256: 6420154269329765208ed4766348a82356028275a2244100e6497b14d5e18527