Malicious PDF — malware analysis report

Static analysis result for SHA-256 358a18536f9212b3…

MALICIOUS

PDF

85.5 KB Created: 2021-03-16 04:26:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 71792961e1c27323b535519150d2536b SHA-1: 98912b3a7482ab3c62ac4294b6a1dc131e646795 SHA-256: 358a18536f9212b35ee89d683d9b1440aedcec0b162cfc01abc5829f0028b2f6
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/123?utm_term=teaching+english+to+young+learners+worksheets PDF link annotation
    • https://bupowuxa.weebly.com/uploads/1/3/5/3/135317106/wimal_komotalamizu.pdfIn PDF document text
    • https://cdn.sqhk.co/tisezalave/bHTghig/tom_and_jerry_drink_history.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/dKhfgdg/21972490586.pdfIn PDF document text
    • https://sodomolu.weebly.com/uploads/1/3/5/3/135398587/3810917.pdfIn PDF document text
    • https://cdn.sqhk.co/fanekizesedi/GYhdjib/name_game_song_for_kindergarten.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/ifxk5pq/96477009468.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/gufibunisudi-jasasogesareraf-lodukejejokus-sorezewowux.pdfIn PDF document text
    • https://tavabaxo.weebly.com/uploads/1/3/1/0/131071290/zuxavo-dadixerinejo-guxug-nutozixibon.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/jdgdYjb/100_latest_trendy_mens_hairstyles_2018.pdfIn PDF document text
    • https://bevufifebuseve.weebly.com/uploads/1/3/1/8/131855995/zidiperoluki.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/guxosa/22072639037.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/zutojafuxipiki.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/hack_password_wifi_wpa_dengan_android.pdfIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_f15607aced474ca1a726389b6f9c424f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/medicare_levy_exemption_application_form.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_7c4f681cbf7643eb93bf382b42db02dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xesigeze/64238384348.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/53198595514.pdfIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_a772312982b343ccacc9a296a3f8298a.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_9b0c83afcf1e4e1ebd3e6db59c95b701.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/66876015318.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_14bd51940825427fbbbb8f147ea8cb11.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_5d39ace3214746b4b781d527beec5f02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/vekalimegisewobaz.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_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 5268 bytes
SHA-256: e188fb0586f7a33a3df5c469371718e909833e2118dd264a0c640208c259e070
font_01_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 11408 bytes
SHA-256: 2b0d0ad414588641cc4cb8c96da59523f6c895e178b05aaa27fc5ed335c140f7

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