Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ea68b0f066e659…

MALICIOUS

PDF

119.7 KB Created: 2021-03-18 20:26:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 4ab36eac046aa73c3cd8e5f5b6dc990d SHA-1: 9709c6109636c3eeb4ee5158e632bb4c0a09f7d1 SHA-256: 61ea68b0f066e65987c6f25cbb44d8a468f6e1e528fbe1c5f3fa2dcfa75a6376
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than a legitimate document, further supporting a malicious intent to distribute malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=practice+with+monohybrid+punnett+squares+answer+key+quizlet PDF link annotation
    • http://dmgameplan.com/73946146146elqwi.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/nikon_z50_dx_lens_compatibility.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/brahmastra_math_book.pdfIn PDF document text
    • http://cosmosqrab.online/gewelovuwuzaviselexaxivewqq12k.pdfIn PDF document text
    • http://idealica-itufficiale.website/fceux_nes_emulator7wq9u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_60461c45253f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403688/normal_603367ae3afd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_602de94de2948.pdfIn PDF document text
    • http://sesalon.xyz/70206440355oejf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_2f2485938c114d28921d8ebba25aa3b9.pdf?index=trueIn PDF document text
    • http://faxiruvud.myartsonline.com/python_is_object_oriented_means.pdfIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_9e17f427f0e74e68ab894a379af43a3e.pdf?index=trueIn PDF document text
    • http://nojikigor.myartsonline.com/26379241260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/885e04a2-cbfc-477f-8347-61b16234520b/jigiduwerafimilowolorev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c19af4-0459-46a7-ba83-2fac9b2a0b93/what_are_good_interview_questions_for_the_interviewee.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_e8a23a849fc24ad99c4b1577f6c3d210.pdf?index=trueIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_60c5b8f9a3974cfebe45c973733fda39.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_a422afb8d0bb4ab5aaf01624ea03ab9b.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_3606f06a6cd5446492f9853bff15c570.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29579fb9-85a8-4ca1-a283-1dbe0521695a/61389704089.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_d3249b69696140a4add0957589d681fb.pdf?index=trueIn PDF document text
    • http://pixafur.atwebpages.com/17967299295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5278b8f-5c85-4412-93f8-26fe2ad723de/64540407799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9545e550-5b05-445b-bd43-f4e0227f1598/sistemas_de_manufactura_libro.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_off00019171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19171 5888 bytes
SHA-256: 9e742b52d4abaad6a9fa8ddd2c1c4f9b761305d0a64135de48c40c8bef1d3602
font_01_sfnt_off0001a569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A569 12636 bytes
SHA-256: d898072cd532becdb2cdbcb1ee5281c2ee7fda6be6fe5e18e60c71ad5d584ae8