Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f9f0d033be5da1…

MALICIOUS

PDF

81.7 KB Created: 2021-04-06 06:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1e888e4a3b204a8a89a455953ac7dba2 SHA-1: ef2be1dff46dd1f1bd310b6e865ceb1d464ac69a SHA-256: a6f9f0d033be5da1157c1fa8378e7f3ec686ee72a6648b215d5451e0aeb3df7a
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded URL 'https://yafferge.ru/strik?utm_term=download+snow+leopard+10.6+8+iso' strongly suggests a phishing or malware distribution attempt, masquerading as a software download. The presence of numerous other links on disposable hosting further supports a malicious intent to distribute or redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=download+snow+leopard+10.6+8+iso In PDF document text
    • https://static.s123-cdn-static.com/uploads/4464541/normal_5feb21a96fd6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5ffc67ccafec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417664/normal_60624e5a6be96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415964/normal_606746bb40e26.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/what_teams_use_the_triangle_offense.pdfIn PDF document text
    • http://datingsexchat.site/how_to_get_better_at_reading_satuxl7j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378857/normal_5fe54f6b9e290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_60253253c782e.pdfIn PDF document text
    • http://fortuneo-enligne.com/can_kimchi_be_dangerousfvmm9.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/taxonomy_of_educational_objectives_handbook_ii_affective_domain.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/adjetivos_possessivos_em_ingles_exercicios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_60170e3d18440.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/22037913456.pdfIn PDF document text
    • http://genusadnlo.space/77629878586s0fea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393179/normal_5fdd7a67e465e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_5fea317d53817.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/bafujetufen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejanifezilo.atwebpages.com/19731833495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e467ffa4-d905-433d-a181-97e9358747c4/67350044899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb085ecc-55d0-4cd3-bde1-303a8d90516e/sophocles_oedipus_the_king_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bafaeb1-e105-4c22-83de-5fc9158e5a5b/wazajudutexujeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65fa9786-c5dc-4233-9343-9f99eede404d/12979121542.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/my_sony_dvd_player_is_not_reading_the_disc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2bb0137-fc8a-4003-a9bf-52e5b75e9527/7779992361.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_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 5620 bytes
SHA-256: d7b7b3c2147163615baff0ee7e0e301fba655cfe3b77002530d33a7c6ebff439
font_01_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 11452 bytes
SHA-256: 2b1fa8a2e02bb6d8fdf522d500ac42e1480298619b2ae4e3e11f9b40c1e717a8