Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2730bb2beb35ef…

MALICIOUS

PDF

68.3 KB Created: 2020-11-24 06:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 95097d2dd6613742a4ec0b4d946b7edc SHA-1: 14f5f1ddf60a709f6b63a31fa753dfd4264558a2 SHA-256: 9d2730bb2beb35ef257807e817187d15c2e23fb50b63907ba400e270f0a8d26b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Sistema de archivo geografico' which directs users to a suspicious URL. The presence of embedded JavaScript, though not directly analyzed for specific actions, is often used in malicious PDFs to download further payloads or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=sistema+de+archivo+geografico PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378161/normal_5f8b199576d76.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/gosifigodasawi-dizowuxu-dazorodeviv-bulapivuzuwile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_5f96f4e8b0cc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5f9b8f26dd974.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/2a6d61b135c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_5fb997597772e.pdfIn PDF document text
    • https://bidukupe.weebly.com/uploads/1/3/4/3/134348295/pajaponok-nonirunuvu.pdfIn PDF document text
    • https://bedakowunuva.weebly.com/uploads/1/3/4/3/134342711/meresoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f8c501f85a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5fa507a409127.pdfIn PDF document text
    • https://dewuvibemezifo.weebly.com/uploads/1/3/4/7/134763410/majunuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fatisake/degupum.pdfIn PDF document text
    • https://s3.amazonaws.com/kimoweworape/standard_deviation_for_grouped_data_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/earth_science_textbook_9th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/guxoxanogovivizos.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/14969690016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD5 5248 bytes
SHA-256: 862f8a27fbc1973bfbfd565ab0123d9315e80ff4c6970818316a8f4143ed4387
font_01_sfnt_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 11172 bytes
SHA-256: 8b5c57b479b9bcf4f3cc4d1efaef8d5f68c9d28c5077bfc8b56b964014172a8c
font_02_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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