Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fe36bea05b02f8…

MALICIOUS

PDF

73.9 KB Created: 2021-05-09 16:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4c0381516bab316742a6c8ba20f49a23 SHA-1: b1f2163ca1f77f578989d623967d77342b74ffe2 SHA-256: 73fe36bea05b02f8bb98cf51316a49c078004f5cd4a3287c5961ab27799cd39f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains a search query related to 'captain's license requirements', likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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+are+the+requirements+to+get+a+captain%2527s+license PDF link annotation
    • http://pivolirarorip.mypressonline.com/nekuferuvemuxosupos.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://setafugeridol.scienceontheweb.net/badger_in._english_for_work._everyday_business_english.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/guQWMWf/parukabipeperovaruxibuw.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/motorola_hs850_bluetooth_headset_charger.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/58623995433.pdfIn PDF document text
    • http://govuled.mywebcommunity.org/manual_artioscad_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/ajclHji/gubofimaxaf.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/crochet_for_beginners_book.pdfIn PDF document text
    • http://help-nanny.site/6076711120572n28.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/6a56cfe6-638b-480f-9187-2bcb3d93053d/36188434312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb01953c-da6c-48e7-abf0-5b1eb836b25c/does_royal_caribbean_have_drink_package_sales.pdfIn PDF document text
    • http://zipemoluligera.myartsonline.com/16901323108.pdfIn PDF document text
    • http://dapibudajemuk.atwebpages.com/sbac_practice_test_7th_grade_math.pdfIn PDF document text
    • http://pitaken.onlinewebshop.net/antony_and_cleopatra_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a99610-1560-45d3-a356-245b567b67bc/83280620666.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_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 5520 bytes
SHA-256: 8773b1d566cf78c2b1f4d12b79b01c53cd55fab3241c37b8f30eba22712c8a60
font_01_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 10656 bytes
SHA-256: 3c149010f2009e9e3b8b0e608ae17457a58672bfa9334b461898cc7c0b6c0075

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