Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8f645dc0bd0ce7…

MALICIOUS

PDF

72.2 KB Created: 2021-02-28 07:12:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 75e7c1b6b1a24d2bf88e5a1cdd0f8a26 SHA-1: 1c558f8ad2bd87a9d688137b4f802f85cf5648e3 SHA-256: 0c8f645dc0bd0ce7f2bc4d2bd2346ed07b1090671502ea31c87be782508f524d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link to 'seumenha.ru' suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, further supporting the malicious intent of directing users to potentially harmful content. The ML classifier and ClamAV detection strongly indicate maliciousness.

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
  • 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.
  • 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://seumenha.ru/wix?keyword=soccer+referee+recertification+test+answers PDF link annotation
    • http://zonerokemub.getenjoyment.net/can_landlord_refuse_to_renew_lease_ontario.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/eda0303f0.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/7554419.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_to_change_the_charging_port_on_a_samsung_tablet.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/c990d751d124.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/what_is_the_role_of_systems_engineer_in_infosys.pdfIn PDF document text
    • https://nofuzuvovakiba.weebly.com/uploads/1/3/1/3/131379181/deram-xavawa-julozunuviza-kibetoxaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xefejevife/27826385495.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/66385453478.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/3793200036.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/8th_grade_net_force_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/juxidofedivoki.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/dadekozejuveta.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/building_blocks_free_vector.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/android_developer_jobs_in_pune.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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 5040 bytes
SHA-256: 2f5f25fe736d73cdcc6873dd190b228174a0c767e03084fa6e0e84488498e0c4
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 11268 bytes
SHA-256: eb7d122b459f5c8419379759d85019067b2bee606e984f23b54b3b66ade3a4ba

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