Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c1d42bb2c7dede…

MALICIOUS

PDF

79.4 KB Created: 2021-04-29 08:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d6aa827ab073da2e4f6dff4e3c271dca SHA-1: 4ee6dc4692dbcb2c7e3def3a2b8a8f2c604496e8 SHA-256: 85c1d42bb2c7dedea0fbb4a1e58fb5f2126fef4c08de7baeba30fe3c252afa57
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=what+is+the+best+book+for+theory+of+computation PDF link annotation
    • https://cdn.sqhk.co/zijigemeworu/giidgcG/vex_robotics_national_competition_2020.pdfIn PDF document text
    • http://morpeoplelife.ru/the_little_prince_summary_chapter_67jx9x.pdfIn PDF document text
    • http://vejofewi.iblogger.org/macbeth_play_script_ks2.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/ggYjggh/torn_ligaments_in_knee_nhs.pdfIn PDF document text
    • http://pabazumakubonok.66ghz.com/72561122684.pdfIn PDF document text
    • http://feruwikabi.iblogger.org/57708950246.pdfIn PDF document text
    • http://farazexob.iblogger.org/sidajinuviwegure.pdfIn PDF document text
    • http://community-day.ru/sipamowivepmo4n.pdfIn PDF document text
    • http://sejojus.iblogger.org/wuxenife.pdfIn PDF document text
    • http://mobile-media.moscow/what_is_the_difference_between_critically_evaluate_and_critically_analyse3ovg7.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/cVjkPkr/o_connor_studios_lowell_catholic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf9fe7e-b6f3-413c-b1d0-3137f9994bcf/80446426190.pdfIn PDF document text
    • http://tasodeporojunez.epizy.com/xafizamusosekaxofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97019731-7f21-4967-9967-6047e24607af/how_to_calculate_permutations_on_ti-30x_iis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259a7265-8732-4a5b-b650-3c1742a76996/sims_3_sunset_valley_families.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b2dca8-9ed6-41ff-ab88-afaac07afb50/jamipaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae39362-9eb2-4986-abe6-fe4fdfc0037d/22498937455.pdfIn PDF document text
    • http://pidukegub.epizy.com/38695301652.pdfIn PDF document text
    • http://torifutipu.epizy.com/dopuba.pdfIn PDF document text
    • http://nixaxefuxib.rf.gd/download_game_maker_studio_1_crackeado.pdfIn PDF document text
    • http://namutogenasokab.epizy.com/les_autodafeurs_3_gratuit.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_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 5540 bytes
SHA-256: 12703afa3e997d56e7d24db0adfc761713a6b221207a3fa8a666524bc12cd440
font_01_sfnt_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 10968 bytes
SHA-256: 187419e760c5b8e8001943bede0add9e2cfa1c0e9c63559227d620760884e7f3

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