Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ba5cfea52832b6…

MALICIOUS

PDF

87.2 KB Created: 2021-03-29 02:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a393134f1987849e0c6ab1b024b77689 SHA-1: 2792dfd05ec1b8b1fcafc7368498d6b8a84fade6 SHA-256: 76ba5cfea52832b60130d947918951d43ab86a508a580459836fffd6ab93a4c7
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-themed, suggesting a link farm or phishing lure. One of the primary external URIs, 'https://zajinet.ru/strik?utm_term=what+is+the+best+brand+of+treadmill+for+home+use', appears to be a malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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 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.
  • 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://zajinet.ru/strik?utm_term=what+is+the+best+brand+of+treadmill+for+home+use PDF link annotation
    • http://lorakuze.sportsontheweb.net/are_mazda_cx_7_good_cars.pdfIn PDF document text
    • http://bekokax.getenjoyment.net/ashrae_standard_202.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/revudafefadewemow.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/hemocompatibility_of_biomaterials_for_clinical_applications.pdfIn PDF document text
    • http://matemepujibad.scienceontheweb.net/57632614597.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/robotic_arm_construction.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/danubojovojalurig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/nawazujeraxuzul.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_63130188a1aa4eacaff19f39e27bce6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1978776d-58ae-4a7e-88ed-03679b479314/fafovigixogovifawifafalig.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/robul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb26d64-e93b-4833-8c9b-ff353fece501/how_to_study_for_gate_civil_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/48480858360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4878e8-494b-4466-9586-5fde2f354272/can_i_book_a_driving_test_online.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_82a5daa3d5c941f9ad798655b02920d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusixa/rovunefegorovudilidamige.pdfIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_75ae6313e2314a3e8ce67128a90a4dce.pdf?index=trueIn PDF document text
    • https://aa4a64a1-c69a-4176-9ab9-82648dcabbba.filesusr.com/ugd/70701b_b0cf549d171d478eb35165e4247f9420.pdf?index=trueIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_1764d09182764aba856ebdf975b81256.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b99856-cf83-42dc-be77-8983f39347f7/kubota_l3130_front_axle_oil_capacity.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/biogas_plant_design_calculations.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_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 5300 bytes
SHA-256: 1eed4d0221a04800d51557bc5663a75aae217710232d742a0ab859a79574f389
font_01_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 10808 bytes
SHA-256: 886536b4ff73e34ec594a422286b66d9fff3d45afd4018d5d40287f1d825b895

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