Malicious PDF — malware analysis report

Static analysis result for SHA-256 663994fd31c175d4…

MALICIOUS

PDF

75.0 KB Created: 2021-05-25 02:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4a6ebd9a4fdc591fb3c220ca85fe0c16 SHA-1: 9ed81650dd8d4fba1eb141267fb5d22132825a5e SHA-256: 663994fd31c175d4a14b990344038c12bbc6742e5e4e9efc8a4d454b227f89f4
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to obscure malicious intent. The primary URL, 'https://botokaw.ru/strik?utm_term=download+game+battleground%2527s+survivor+battle+royale', indicates a lure related to downloading a game. The ML classifier and ClamAV detection strongly indicate maliciousness, and the presence of embedded URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=download+game+battleground%2527s+survivor+battle+royale PDF link annotation
    • https://pisiteju.weebly.com/uploads/1/3/5/3/135314571/bubalawo.pdfIn PDF document text
    • https://kipidabivipili.weebly.com/uploads/1/3/4/3/134340994/notomabukive.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/fapin_pabodalefines.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/bitevuk.pdfIn PDF document text
    • https://xajasirofoxuki.weebly.com/uploads/1/3/5/3/135330212/doxuvimujolubikajir.pdfIn PDF document text
    • https://jususisizeka.weebly.com/uploads/1/3/4/2/134266965/dejisirozanekalipe.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/garibum.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/f961985e-7914-48ed-82d5-30e16bae4b1b/48894433319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63474547-82e1-4a45-b22c-ed40903c8522/7726030340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96747873-d9b6-492a-9dec-78891c0c61a6/volume_of_cylinders_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c53767-cbfc-4636-8299-a539e374ebc5/mekupabevalazizarik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/386dfa6b-a259-41f5-a950-da9bb2701560/how_to_reprogram_my_clicker_garage_door_keypad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1afa87-3d84-4951-b5ea-d17fdd0ee4cd/how_to_get_aircraft_maintenance_engineer_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a35994a-80a1-4544-ab5a-20c34c9a4538/61459032049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5160bd78-5aa3-4e94-a327-4b25d7f6965b/7444279698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5303cc66-a1e4-4685-a8d4-49c35027e2e0/is_it_safe_to_travel_to_mexico_city_while_pregnant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc538cc-8cea-429c-88ee-5e20cfba2a86/65787062334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf369524-2ce6-4b1f-b345-cb31ea082992/what_do_termination_for_cause_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c10eb6-3382-464a-987a-86e5888bcfec/dekigaguneradoxagal.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_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 5572 bytes
SHA-256: 92211866bfff2e929dcb8038e562dc2cb156b6f74b009987b9ea11e5966e62cb
font_01_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 12100 bytes
SHA-256: 26f66c645ad0d2fa278d8464c5a4ae214c96968cd9f3f5513c015cf55b8c395e

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