Malicious PDF — malware analysis report

Static analysis result for SHA-256 8624e6fe4509bde0…

MALICIOUS

PDF

81.5 KB Created: 2021-05-18 09:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b47bfc01ffc6f26ade816f539601200c SHA-1: d96ced0572552a4af892aebfb096d84845865ed7 SHA-256: 8624e6fe4509bde00b1c610319ecb3d9f06738060dfaaaba06e0ae4c76d809a9
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+spoof+pokemon+go+iphone+6s
    • https://jamobosis.weebly.com/uploads/1/3/4/6/134684796/tesal_kurivefa.pdf
    • https://raguwamirib.weebly.com/uploads/1/3/4/6/134630778/0df1617c6.pdf
    • https://vewuwoxefi.weebly.com/uploads/1/3/1/3/131379256/61fcc1.pdf
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/c6e2b8a835d138d.pdf
    • https://saxalixoze.weebly.com/uploads/1/3/7/4/137498754/d00f041.pdf
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/jurumejena.pdf
    • https://xerotopofuwega.weebly.com/uploads/1/3/1/4/131406930/zomiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bezegoluzose/xikilaxuvovanobarokir.pdf
    • https://uploads.strikinglycdn.com/files/d761c707-8d7b-44f5-802b-bba9d490c76d/kedibasudisupodim.pdf
    • https://s3.amazonaws.com/latufenaw/tidifurevilosobuta.pdf
    • https://uploads.strikinglycdn.com/files/2a162a79-2ac1-406e-a5a5-e8663234fc5a/what_are_character_strengths_and_weaknesses.pdf
    • https://uploads.strikinglycdn.com/files/ec7e74ff-44c4-43f4-aa43-287cabe34ee8/data_structures_and_algorithms_in_python_goodrich_download.pdf
    • https://s3.amazonaws.com/gonasidupij/cut_songs_for_whatsapp_status_malayalam.pdf
    • https://s3.amazonaws.com/fobupojowojon/how_to_adjust_brake_controller.pdf
    • https://uploads.strikinglycdn.com/files/ab1c037e-23ee-49b2-88b7-dd8438349ff2/57821396638.pdf
    • https://uploads.strikinglycdn.com/files/f30286c0-635a-4226-a57a-a130e4ef301e/vaguz.pdf
    • https://uploads.strikinglycdn.com/files/6b64927d-8d5e-4864-af7e-593c4e07cfac/is_the_white_princess_the_daughter_of_the_white_queen.pdf
    • https://uploads.strikinglycdn.com/files/4c3522da-8c7c-4ca9-ab4d-a75c1b0932a3/6976955016.pdf
    • https://uploads.strikinglycdn.com/files/90c874d8-f7f5-4212-a04f-1c6ee51fa22f/netgear_n600_c3700_vpn_setup.pdf
    • https://uploads.strikinglycdn.com/files/4ba489f0-35db-4472-a474-57bf13ea890d/lowrance_elite_4_fish_finder_manual.pdf
    • https://s3.amazonaws.com/pegek/qantas_frequent_flyer_membership_application_form.pdf
    • https://uploads.strikinglycdn.com/files/0a4ea765-dfac-4d98-b6bc-528e39bdcd32/2090923393.pdf
    • https://uploads.strikinglycdn.com/files/bc1b2e30-e2e4-402d-a6df-4498b1c2228d/saeco_royal_coffee_machine_service_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e0.bin
caf743a0b6faeda4630df4c87d5afbba90902b1f8d4cbfcb696eceb450133adc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 5036 bytes
font_01_sfnt_off000102ef.bin
e476d9d5246f11c1219fceb1a2d68c5ded33f1c328137c38e3474eb3f0191f3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 11480 bytes
font_02_sfnt_off00012a03.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A03 4324 bytes

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