Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d04fad757fc5a3e…

MALICIOUS

PDF

80.3 KB Created: 2021-04-05 06:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a38cb4f7b49ed20b1cd1da40e85bbea9 SHA-1: 486624cdea6ca4410c611df0ba48c0ba388730e4 SHA-256: 2d04fad757fc5a3e6a5a10ea47c51d9cf4ae66a2cf1f0e4352c908701f8f847b
184 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains and redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as 'https://yafferge.ru/123?utm_term=fun+math+riddles+worksheets', are likely used to redirect users to phishing or malware-hosting sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=fun+math+riddles+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_6024ef84ec9bd.pdfIn PDF document text
    • http://xipevufizokev.iblogger.org/losiragarofiwesup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_6044f5cecf851.pdfIn PDF document text
    • http://fabujisaw.mygamesonline.org/brat_diet_patient_education.pdfIn PDF document text
    • http://jufidozotazi.66ghz.com/64764944259.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
    • http://getozareburi.rf.gd/coordinate_plane_worksheets_pictures_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec839d87-1e3b-4ed1-9d72-e3cde9874638/how_to_use_trimble_business_center.pdfIn PDF document text
    • http://xaderupib.rf.gd/mastering_blockchain_packt.pdfIn PDF document text
    • http://jopavufugas.epizy.com/81531635817.pdfIn PDF document text
    • http://movebuze.epizy.com/burger_king_coupons_2020_mai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0c0c55-e0cf-488d-8748-ee20fc9ced0b/is_cyberpunk_for_ps5.pdfIn PDF document text
    • http://nomapalugaji.epizy.com/95832470201.pdfIn PDF document text
    • http://gesovak.rf.gd/88076266033.pdfIn PDF document text
    • http://vijatabudevibe.epizy.com/puwanonanolorolepaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d64b0c1-103a-4bfa-9abf-9607ff605644/binoresewawedo.pdfIn PDF document text
    • http://texibelejojofo.rf.gd/how_much_money_can_you_get_from_tiktok_views.pdfIn PDF document text
    • http://vugugemo.atwebpages.com/botefemara.pdfIn PDF document text
    • http://puzegekizizovin.epizy.com/numizisakozeb.pdfIn PDF document text
    • http://jizonizop.rf.gd/89598405365.pdfIn PDF document text
    • http://pubilovojut.epizy.com/52006143335.pdfIn PDF document text
    • http://nogafojomor.onlinewebshop.net/ielts_writing_answer_sheet_2020.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_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 5060 bytes
SHA-256: b2f9bfa07f655498fb635b6f142fe1e766e5d6c8d7b9a1404a1e758234be4884
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 10880 bytes
SHA-256: 790264a46c6cc97d1b06ae7ea9fcc75f241084b5566649ae6b1d64c1d5ebdf3b
font_02_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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