Malicious PDF — malware analysis report

Static analysis result for SHA-256 911246174207c395…

MALICIOUS

PDF

119.2 KB Created: 2021-03-10 01:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 562e0e0eb2a15a0111c729c112cfd42e SHA-1: 6dc7172a3ef8369b675303d7960f1fdcb575b69e SHA-256: 911246174207c3950db672542f1ed8c58e93dee6fdf5d6f9f406da6383801ced
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the URLs and the ML detection strongly suggest the PDF is designed to redirect users to malicious content.

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/aws?utm_term=what+are+the+un+sustainable+development+goals+pdf PDF link annotation
    • http://womenit.space/the_first_law_of_thermodynamics_worksheet_answersopqa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_6022be8cbd56b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_602f0b5744a8e.pdfIn PDF document text
    • https://vorufiduwesonuf.weebly.com/uploads/1/3/5/3/135314955/4fb6596e1b2.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/c00dae87e9d035.pdfIn PDF document text
    • http://vufarizuluf.22web.org/fadezim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_600c804791877.pdfIn PDF document text
    • http://kulokozataxat.22web.org/poseduje.pdfIn PDF document text
    • http://pasendapp.online/challenge_rating_monsters_pathfinderviveq.pdfIn PDF document text
    • http://wavarev.22web.org/book_to_read_in_english.pdfIn PDF document text
    • http://13millions.store/decimal_division_worksheet_for_grade_56sbat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_602daccd2a5e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vomalowo.epizy.com/49646782831.pdfIn PDF document text
    • http://xifebudi.epizy.com/freeze_excel_worksheet_tab.pdfIn PDF document text
    • http://siwerixu.rf.gd/92795739820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9a9ffb-4935-4901-820b-315dbf2de0ba/how_many_ounces_in_dunkin_donuts_large_coffee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e1f1e9-0416-4a4d-8971-45f82a070970/how_much_does_it_cost_to_install_a_heat_exchanger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a6aa18-1c72-40a8-8ca9-76c2d245592c/bewilozolase.pdfIn PDF document text
    • http://gumavefuve.rf.gd/doxizuluvesipivudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb1e16b-537d-4115-9ed4-5bf112736ea3/can_you_capitalize_interest_expense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a205f48-4941-44d8-9244-7f5015d2ba10/how_to_make_creamy_cajun_butter_sauce_for_seafood.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000187f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187F9 5548 bytes
SHA-256: 0823caf469b93c5dc2f8e2db45a35b02e360bf6d1b68992ad180aa2d36b34bc2
font_01_sfnt_off00019ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AB2 11496 bytes
SHA-256: c4adba5bad7161c2619ab802ca9d846960d31616cdd25679b2f883eabf3c2263
font_02_sfnt_off0001c0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0F3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333