Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d752934cebd0bf…

MALICIOUS

PDF

79.6 KB Created: 2021-04-28 21:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 69566c4c60326d59fafb1898489f2ccf SHA-1: 23ff4bd097a413d76c4e47a37ef029a90841baef SHA-256: b3d752934cebd0bf86ae419f0455cf4985f99226e1c9f7232681c7830e79c71a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The primary malicious URL identified is 'https://soxebez.ru/strik?utm_term=is+stauer+a+good+watch+brand', which is presented as a search result. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with 'http://losexuzumobobe.epizy.com/jikigukotizamaselifuve.pdf' being a notable example hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=is+stauer+a+good+watch+brand PDF link annotation
    • https://fofawuparojimi.weebly.com/uploads/1/3/1/0/131070926/8529107.pdfIn PDF document text
    • https://jemiliwolozeli.weebly.com/uploads/1/3/4/8/134870182/dijexizujun-momuw-sovipiwazor.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/1d84a1d254.pdfIn PDF document text
    • https://zodaribidibukez.weebly.com/uploads/1/3/4/7/134716266/3114175.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/belisivojixeba.pdfIn PDF document text
    • http://matadidofedokod.22web.org/.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://losexuzumobobe.epizy.com/jikigukotizamaselifuve.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_3ad3028a8aea44a1bde0346c2d645c64.pdf?index=trueIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_445cdb690e1b44b5b086def92b48e7ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62493da-3059-49d8-933a-91b581b263cf/ford_service_centre_near_me_contact_number.pdfIn PDF document text
    • http://werewipabelud.rf.gd/biosynthesis_of_saturated_fatty_acids.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_dd3c2bce49e847dc8e1a5996bcc1db2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a5a2cf-2080-47bf-b1ce-f054f1d636a9/purpose_of_writing_a_reflective_essay.pdfIn PDF document text
    • http://benepuru.epizy.com/jevokusiragizunudedufawol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a072df9-ad95-4e0a-985b-4cd05ba50bc6/can_i_claim_maternity_allowance_and_work.pdfIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_2eace1174f5246bf8ccb2689d6807fa7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdefda3f-d8e9-4b2d-9782-f49aef3a4a1a/uscg_alameda_medical_clinic.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_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 5336 bytes
SHA-256: bd92de1ef65627afb21aefb9cefe7eddedc599e04a877ee770c2dc7be570dd78
font_01_sfnt_off00010bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 11124 bytes
SHA-256: 08bd878d40c32bcd5dcd4eb59c07d75b9b665b23d2ac2e3a0c92baef59988142

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