Malicious PDF — malware analysis report

Static analysis result for SHA-256 351c48c3c1f1efe0…

MALICIOUS

PDF

104.1 KB Created: 2021-03-18 06:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ee4d3e2d3eafc35f7062329afc8b56ca SHA-1: a7edbfedab3241f38cc040e8e3df713ac05ce64a SHA-256: 351c48c3c1f1efe0812632dd6aef24f8ad031457ad6b0939c91534c5aaeb6bb6
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary URLs extracted is https://kuzutuzo.ru/strik?utm_term=nikon+d3200+costco+bundle, which appears to be part of a link farm. The ClamAV detection and ML classifier also strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=nikon+d3200+costco+bundle PDF link annotation
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/894939.pdfIn PDF document text
    • https://vakikuxikedeti.weebly.com/uploads/1/3/5/3/135320305/1b623e74c3.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/vavapekadoliti/xivajob.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_e6da4ec7ff02495489542bffb6943531.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/are_dmv_offices_open_for_driving_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2afd062-bfad-4164-9439-11ca118082e1/rugodusolit.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/memeka.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_9209bc3569da40398abb1a74513bb301.pdf?index=trueIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_d1c34c8997574d67a1f2d10ff734ac76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8fac444-15a9-4d79-9ace-2899302936d3/55417890218.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/wifadoxovoxutiwivolefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99d278a-852b-4ece-9e01-329ea909a75e/donate_clothes_to_homeless_shelters.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_e346f772bb4b463c97735f70529642dd.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_21ca9ed2e2ad40f4a4cf407575992268.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/45804131603.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/pisirunoji.pdfIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_dc06090ea09c47cb97bd5506dcae4cc0.pdf?index=trueIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_babb21ed0e50453f8753513bce258081.pdf?index=trueIn PDF document text
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_bd5f2cbb483c4468bef11f8f0f73c4eb.pdf?index=trueIn 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_off0001517e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517E 5236 bytes
SHA-256: 4315cbfac0f1a30f0dd715aaaca75aca5fc16f72b409970fba9134a9a189d113
font_01_sfnt_off00016369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16369 14476 bytes
SHA-256: 5fcacf370d6a3f358201cb9c8481d6220bb8172be7dd4bb5f79c3fd008b5a4b6

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