Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11d4b69b2acf34b…

MALICIOUS

PDF

72.2 KB Created: 2021-06-12 15:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 62f820e753b930fd748422f90bb82330 SHA-1: c55e30a0581415d39bf78193604e287baf175c41 SHA-256: c11d4b69b2acf34bec039182bab47b988ed358d9892ea87ccf74b1918ecb421e
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 numerous embedded URLs, with one prominent URL pointing to 'crewmak.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/pbw?utm_term=piano+sheet+megalovania PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4476578/normal_60b2a46cd457f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_5fdba64172642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_6023fc1a522fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474985/normal_5fe4299d19cea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_6000801468e41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_60650f649049a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_601ad1b5b751f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_605b5173d4404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_600f73dd23aa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_60bf492aa0705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487632/normal_601c8c7daf38b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465249/normal_5fe0bcbae1ef6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/145042212/second_habit_of_stephen_covey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7386089-043d-4eeb-84f0-c821c481d0c1/rozezozadek.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/f/real_car_parking_2_driving_school_2018_hack_download.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144412536/vamupaxodoxedigexor.pdfIn PDF document text
    • http://kukuwowuxen.pbworks.com/f/cesarean_birth_plan_template.pdfIn PDF document text
    • http://fawugomem.pbworks.com/f/xivomogamabusizi.pdfIn PDF document text
    • http://nafidob.pbworks.com/w/file/fetch/144601077/who_pays_for_parental_leave_in_sweden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4090971-816c-4bd0-8089-a05195a74f79/lukuzelijonemikuzakezag.pdfIn PDF document text
    • http://fokurid.pbworks.com/w/file/fetch/145006059/fifa_19_deluxe_edition_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18da010-0b27-49d2-8c23-4908937b0fb1/98594563291.pdfIn PDF document text
    • http://morabef.pbworks.com/f/how_to_get_a_free_membership_on_prodigy_without_paying_2021.pdfIn PDF document text
    • http://molosafokaji.pbworks.com/w/file/fetch/144622581/kong_crate_mat_cleaning_instructions.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_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 5064 bytes
SHA-256: 9bb30ecfc65e89e9d05225795fc2d57cb2d5bb989e49159effab1cf23e451817
font_01_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 10840 bytes
SHA-256: 7ec3c36110c54174a5adb2db401f45dcb796283a6b104ca05e584d3784ba7dd9