Malicious PDF — malware analysis report

Static analysis result for SHA-256 b587ca0008f344c6…

MALICIOUS

PDF

86.6 KB Created: 2021-06-13 01:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8e4a1a4181a90b718ac2e8320e37a9b1 SHA-1: cf61fee6228f12667d1ec1f16e91a14b242bb4f3 SHA-256: b587ca0008f344c6e0c2f18bf98a1c64ff8c538eaa7337bdc5a86d14ad6584af
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://infrive.ru/pbw?utm_term=need+for+speed+no+limits+offline+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393900/normal_601870e90b44f.pdfIn PDF document text
    • https://kepinofex.weebly.com/uploads/1/3/4/0/134017679/210ea786f.pdfIn PDF document text
    • https://tigisara.weebly.com/uploads/1/3/4/6/134651617/serofetesijosajej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5feb2abac89f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479224/normal_602ea0ffa2211.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/govefizexaxa.pdfIn PDF document text
    • https://dixawofira.weebly.com/uploads/1/3/5/3/135303501/4dc6265dc.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/77fb3612-651f-4f01-8ad8-997fde1a9a11/what_happened_to_alfred_pennyworth.pdfIn PDF document text
    • http://duvetemeb.pbworks.com/f/34488750422.pdfIn PDF document text
    • http://jijagenaneke.pbworks.com/f/55967307974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d0b715-b688-4af3-9e6a-54854bacb8ff/pagoka.pdfIn PDF document text
    • http://dewubuk.pbworks.com/f/solving_multi_step_equations_with_distributive_property_worksheet.pdfIn PDF document text
    • http://gozuwef.pbworks.com/f/7560193785.pdfIn PDF document text
    • http://masawumel.pbworks.com/w/file/fetch/144791544/17562401715.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/you_break_i_fix_janesville_wi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce297dd7-8b79-4ff9-ba6b-3342f5819969/fasejugatulogaxos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637e3a44-dd28-414e-a9c8-5852ec1f0382/15553874122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed37a50d-784d-4da5-88dd-e33fce0717b0/evenflo_car_seat_infant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f5b70c-9825-4085-bddd-702bf7db5678/97962690966.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 4420 bytes
SHA-256: e7c64f107915acf4e091157d79cce2738d1c566e4d9f14706ed7d510b634ba2f
font_01_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 5220 bytes
SHA-256: 38d0d41b3779284324eea3a1701cd7468cf8e506a322d49024669ccac30ef799
font_02_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_03_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 17064 bytes
SHA-256: 9114c6bfddbe3f215b13cbcb106ad53b807bbbe6f12d031ce6a01ff9cfd8b937
font_04_sfnt_off0001367a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367A 16164 bytes
SHA-256: 87476a94fee23735b039484ff5c3baff45b37dc7ae94747cad57bc8a08204b8b

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