Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6298a5a8d1ec30a…

MALICIOUS

PDF

74.9 KB Created: 2021-03-31 05:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8b1934a1f4fbd07fe7ddc92e8c4aa822 SHA-1: 23584e0f56621b4934ce66c95a92f8ba1dc50b2d SHA-256: c6298a5a8d1ec30a3812bd393a15b3d8578494bcbe4a814bcf21745b2a590634
156 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 pointing to PDF files with numeric slugs, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to malicious sites.

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://golowaki.ru/award?keyword=makerere+university+private+admission+list+pdf PDF link annotation
    • https://faxefijuw.weebly.com/uploads/1/3/1/8/131872096/poxigovuxezege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_60046e0ade8d7.pdfIn PDF document text
    • https://zaxadumumuguxe.weebly.com/uploads/1/3/1/4/131454216/7820298.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5feb610badf4f.pdfIn PDF document text
    • https://fapojenulexo.weebly.com/uploads/1/3/1/3/131383319/8634231.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/f0d6e692f9.pdfIn PDF document text
    • https://ligavovifoma.weebly.com/uploads/1/3/4/5/134522072/a351ec78d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409113/normal_60620b4604567.pdfIn PDF document text
    • https://musimisipamorek.weebly.com/uploads/1/3/4/5/134594646/1e64ed.pdfIn PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/povud-vesisatoferi-bajozi-xetiwoki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465402/normal_5fefc7c100c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_6029dc4436ad4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490528/normal_6006e29875c9b.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/fajujiju/chrysotile_asbestos_safety_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/how_much_potassium_in_a_medium_red_potato.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/love_potion_number_9_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b879d481-d796-4e65-b674-4a51a3a90700/nigakaxujoroju.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/gesijuvizezomuwoz.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/economic_vocabulary_activity_chapter_1_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a857d5a3-573a-4c6f-a2bf-ca26851cba36/71059699132.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_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 5416 bytes
SHA-256: 4a8e1be4d957b2c6f4a286266ca33e316682adeb64012d8578ba30090d2a29d1
font_01_sfnt_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 10740 bytes
SHA-256: d8d9cb811299dae358b85c3462aff65d2897d49679dd4013bf0bbb74f98c24f9

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