Malicious PDF — malware analysis report

Static analysis result for SHA-256 7141a3c837f9d534…

MALICIOUS

PDF

71.3 KB Created: 2021-04-19 08:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7060a7b6786c3a879b94cb70f87dd21b SHA-1: 6f5ee4ca9e167e965df78c58427eb02e879130f9 SHA-256: 7141a3c837f9d534c1216fed23bbc8a23304a49c12a28b2cda81335ba64fee35
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' in one URL and the 'service_manual' in another indicates a lure to download files.

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 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://kuzutuzo.ru/strik?utm_term=brother+2270dw+drum+unit PDF link annotation
    • http://mozobadijoba.medianewsonline.com/bizhub_c227_service_manual.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/72781620197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_601a184bc8f22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_6057be960359f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474752/normal_60634fa164d13.pdfIn PDF document text
    • http://nomiwiturej.getenjoyment.net/magic_quadrant_for_application_security_testing_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_5fe7a8cf11ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390323/normal_602981c0391aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_5feaef78241b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_601e217d35133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_604201040d5db.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/18e85392-0dd6-4c57-b22f-cbeb43166e09/the_new_encyclopedia_of_modern_bodybuilding_the_bible_of_bodybuilding_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fdd4776-6e5c-435b-80df-cd7d48b8a8ce/how_to_scan_multiple_pages_into_one_document_on_an_epson_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22960237-5760-4a87-9392-1687b3df0c12/guloliwebivetokag.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/78051342574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d84e61-158c-483b-982a-ac36b7af3163/kisoxogerula.pdfIn PDF document text
    • http://zogivumomu.epizy.com/android_studio_3._5_gradle_plugin.pdfIn PDF document text
    • http://miviguwi.epizy.com/guwuxovezipipepupob.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_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 5140 bytes
SHA-256: 96f1b6a37898de9d4f7ff71729c0787589c9d8c79e1e458fe417d010b9afbd6f
font_01_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 11348 bytes
SHA-256: 5a3fcafcb24fc1e76a610b5bc3d7d9f2e969dcfbfcbdd403736091890bb14a18

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