Malicious PDF — malware analysis report

Static analysis result for SHA-256 5653860741cb194c…

MALICIOUS

PDF

109.8 KB Created: 2021-06-02 14:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9a40c1d6a3c61ef2a085410a57b19c4f SHA-1: d2ff5d7c26e2501911417c9c8b938c304b908441 SHA-256: 5653860741cb194ca2a44b073456f8a48cc646a2a68d3924f0433fb324d16fdc
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that masquerades as a math answer key, a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URI are indicative of a malicious document, likely intended to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/pbw?utm_term=go+math+5th+grade+answer+key+chapter+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461786/normal_600aa7d2d2b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425913/normal_6062af569740d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_6067daefaac59.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/26a3fcbf-5bcd-4d23-be81-228bc363709b/ben_hogan_power_golf_grip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9a698b-1ee7-43eb-bc31-b873b49fcf1f/2109755021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30154dca-ead9-4b1d-a80e-1ca2cdedd690/suzuki_sidekick_4_door_4x4_for_sale.pdfIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144496989/35991740245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ec4578-95e0-48dc-b24d-0ab759de077c/which_universal_has_harry_potter.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/26199662437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdc1782-086d-4118-bf4a-fe2c8621717f/nesef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3377da98-e3e7-4c2d-a832-fe4caaa1470a/81730634169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78723aa7-859e-4f27-8792-40e56d7b3709/wuwotitupejimadapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33323823-ce17-4720-b8c7-561fe8a30975/is_delonghi_good_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe41cb5d-051f-46c7-93d7-3830a2b5b4f0/fagotipobudivudutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9756a4a-f17b-47a6-a201-0249d45af818/is_no_game_no_life_discontinued.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5b536df-3e7c-49f2-9a82-2c5d349f9bb6/why_does_my_lawn_mower_stall_when_i_engage_the_blades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8c9ff3-7d4d-4529-8409-325c4d996c59/the_little_prince_book_review_essay.pdfIn PDF document text
    • http://supijexed.pbworks.com/f/92870748392.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144488430/dobadozasapirizok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2443f9ca-a891-4da0-a25f-da6a65d04a0e/47514788911.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_off00016085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16085 5804 bytes
SHA-256: e87d369e54453c6ce12badf927b2aaddd14e8c1acca751aabc3af62c92d4d745
font_01_sfnt_off00017437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17437 11432 bytes
SHA-256: 344ad69d93afe01c60dfad02bae38cdf389cd8ab9f94bd6fbef525dc6d56e5ba
font_02_sfnt_off00019b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B44 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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