Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5134dba27aa6e5…

MALICIOUS

PDF

62.5 KB Created: 2021-02-20 22:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3f8fbef1648de712f80abe7a33681d86 SHA-1: 285cc60b93a07b074a2d6960bf037d7d059a6938 SHA-256: 7f5134dba27aa6e508fe5f5c8e3e7ea61c1dfe4b190ceeec6fbb4e1152598cef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely distributed as a spearphishing attachment.

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://jacksth.ru/wix?keyword=mca+test+sampler PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451929/normal_5ff927df9e33a.pdfIn PDF document text
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/5093430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391899/normal_5fe29e2b20d32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444095/normal_5ff20a18d5441.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411490/normal_5fcb2cdad5083.pdfIn PDF document text
    • http://babixuxuw.22web.org/83301582744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desavoz.epizy.com/aqa_gcse_examiner_report_2018.pdfIn PDF document text
    • http://vilulew.rf.gd/alien_dance_song_naa_songs.pdfIn PDF document text
    • http://mekidojakad.rf.gd/halloween_invitation_flyer_templates_free.pdfIn PDF document text
    • http://gozipoxux.rf.gd/logo_quiz_android_bubble_answers_level_11.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/sogamavasur.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/samsung_blockchain_wallet_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/bangla_natok_2018_jovan_mehjabin.pdfIn PDF document text
    • http://gevuraragide.rf.gd/41612391099.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/beach_head_2002_cho_android.pdfIn PDF document text
    • http://voxinuxo.epizy.com/xalosapudobute.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_off0000bbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCC 5084 bytes
SHA-256: 22050d6411c45e60182989fe612e80c2c49b47c515aa0a011430931ebfc21b39
font_01_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 9568 bytes
SHA-256: 77f32da222fc72985440c0b60f2aeba1ba80653c9bbe8a7bc5eed9e82b1a6d4b

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