Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe6b6fd6da43645…

MALICIOUS

PDF

89.9 KB Created: 2021-05-01 03:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1451ed99e83444389b2a6d05ac02b79c SHA-1: 7cca2e9b0d68739fb0f2b355692bb62d13c3a25b SHA-256: cfe6b6fd6da43645343008b00ffc2e8308aef23e6c5e52e93caff7ca7022cdf1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary URL, https://kuzutuzo.ru/strik?utm_term=two+minute+mysteries+collection+pdf, appears to be the intended destination for users, possibly to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=two+minute+mysteries+collection+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481662/normal_60226aa8d68a5.pdfIn PDF document text
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/banoleloputeg_kejetinoki.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/rjjdXii/90811587134.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/6fffde.pdfIn PDF document text
    • https://cdn.sqhk.co/xozawimepod/ehJhcFt/pptx_calendar_template_2019.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/lawulenunemexobixaku.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/jNoq6hb/fosijetivujalisazofidu.pdfIn PDF document text
    • http://bopikifej.22web.org/2460661915.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458148/normal_5fff0e58cb315.pdfIn PDF document text
    • https://rixemeja.weebly.com/uploads/1/3/4/7/134711448/cf4cc8.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/4f720f51-ebf7-4359-981c-4420b7a143c6/como_se_dice_inteligencia_emocional_en_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a7223b-3808-4037-adff-c218f9586a22/how_to_write_mathematical_proof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85980120-0538-4e44-8903-39b38d2503f2/how_to_add_kwikset_to_z_wave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d734b0eb-318a-4562-8aab-9b25131f246f/romeo_and_juliet_paragraph_writing_prompts_act_1_answers.pdfIn PDF document text
    • http://pijerogovilowum.rf.gd/mesak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1a3e9d-820e-4d7e-aeb9-e51a7988c7db/39080264467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fba9d17-be5c-447b-a9b9-eb4a98d43118/80690697902.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_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 14332 bytes
SHA-256: b81c34f9ab05fd88a21206c0ac2d568e36c4dc6deada1284814e0b1d93b69359
font_01_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 5236 bytes
SHA-256: defa7f198b563dbc42c576eefc978bdc85f2daf64e15fcc2d22f1ee7ee74d416
font_02_sfnt_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 12672 bytes
SHA-256: d5211d0689d798aa61cd83b77c90eb6aa6c7de99f428ff93a36dfb58c092323a

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