Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b2d65264486cac…

MALICIOUS

PDF

79.9 KB Created: 2021-03-12 21:20:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 026d3e5e4eb09c0f09f111b43e58ff2b SHA-1: c242f28e8b80e8c61a6f693d1620f1f461875531 SHA-256: 16b2d65264486cac6db6dd79e828a0ac92e0fdaa3f57ad9d49ec4ae3d8b6f04a
214 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/strik?utm_term=dayton+electric+baseboard+heater+wiring+diagram'. This URL is associated with phishing and malware distribution. The document body, though heavily obfuscated, appears to contain text related to electrical diagrams, suggesting a lure to trick users into clicking the malicious link. The ML classifier and ClamAV also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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=dayton+electric+baseboard+heater+wiring+diagram In PDF document text
    • http://reduslim-shopofficial.site/the_crown_season_1_episode_8_castle44ala.pdfIn PDF document text
    • http://virona.org/70028607920st7q4.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/what_is_positive_attitude_in_psychologymk5td.pdfIn PDF document text
    • http://degitowexara.iblogger.org/does_samsung_replace_screens.pdfIn PDF document text
    • http://businessoutsourcing.info/nunuwov6mgt9.pdfIn PDF document text
    • http://itali-big.space/home_cinema_3700_manualh0uk5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_c2df4d743a1f434fa996fd76b612ac26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/sony_xplod_600w_4_channel_amp.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/gutuwos.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_14ddd80c8e454cf3b6dee9ec0b0a1c54.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_5c2b0714649e4a34a084ac09ea58c493.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/auto_pro_pad_lite_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/lavekujovixebazibezaj.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/reading_plus_answers_level_i_environmental_disasters.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/comptia_a_certification_exam_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/87896023175.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/zazaderexokewofojukatuma.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/life_is_beautiful_all_songs.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_b6738049ee9c4b29bafdebe03b095b35.pdf?index=trueIn PDF document text
    • http://bogurivesinoni.rf.gd/and_gate_circuit_diagram.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_2ee91cd9ae0d447689e7b6b8aacd3b61.pdf?index=trueIn 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_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 5688 bytes
SHA-256: f8ebd38868cfe53e725bf70a5d9995a2a43c48c13c37f536a3ef7ce07ef78eea
font_01_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 12256 bytes
SHA-256: 1aa375c43e8777f26593602873fe630cc7af3e7370f55b60c4bbab0b01f0ca52

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