Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3f5dd936951ace…

MALICIOUS

PDF

95.7 KB Created: 2021-03-17 22:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6b5e0be4950937bf4f33c5934b50e50a SHA-1: 552b5506d575d4cf090c238b9ac96db6d709286f SHA-256: 8c3f5dd936951aceec85ecbbb1b186629d8c58d81ddce7e424273a4fdfbb716a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential phishing lure pointing to 'jacksth.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=what+is+the+4th+realm+in+the+nutcracker PDF link annotation
    • http://tiburozikibuvex.22web.org/69545620922.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/5953694460.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/cc2572c54f.pdfIn PDF document text
    • https://jufozafofover.weebly.com/uploads/1/3/6/0/136050361/zejupanafirika.pdfIn PDF document text
    • https://tajuzoliv.weebly.com/uploads/1/3/4/3/134359899/824565b.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/jhpghBo/topeligesokigokutisugaj.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/1cf9fa4606.pdfIn PDF document text
    • https://cdn.sqhk.co/pemiduwegam/d76ifMs/jobilidodoxepelitogisew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1e16d55d-4a12-4b04-b4cd-e0b1e032ff9a/34684973311.pdfIn PDF document text
    • http://gexegufikide.epizy.com/a4988_driver_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/83191622192.pdfIn PDF document text
    • http://toxisokipefofo.epizy.com/99987820783.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/multiplying_fractions_worksheet_answer_key.pdfIn PDF document text
    • http://tosefiwaniw.rf.gd/rational_function_examples_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/how_to_fix_water_hammer_in_my_sprinkler_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d9009e-5189-453f-9bcd-08e4d06be9f4/54459514451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b652dc83-8ea3-4b7a-b4fd-1b6f2e7c447f/canon_eos_rebel_xti_400d_lenses.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/one_of_us_is_lying_summary_chapter_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11168a7-c383-43ae-be00-2c3dec450216/jujekor.pdfIn PDF document text
    • http://jowosos.myartsonline.com/78994880154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30555cbd-f665-4ef5-94d2-a3a652bd7372/benanexubarox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE7 4976 bytes
SHA-256: d8187632b6053c3d76f551d92493db26bb74e3d9d59af05c173fcbce95fc3338
font_01_sfnt_off00013bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAD 11868 bytes
SHA-256: 454b9609c094a1293405b6091f10c61a25d7ad25cec81085b3c6fe7e1f175b29
font_02_sfnt_off0001630d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1630D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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