Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4f896ab84bf0b8…

MALICIOUS

PDF

107.4 KB Created: 2021-04-17 18:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: adb14981a230da542e1542ea531c0116 SHA-1: 588a7d7ff378c8099fcd9363b4f8080e1a76398c SHA-256: 5c4f896ab84bf0b8973af046247688cf7f7c3cb7a3e17b3bcb5a7d93ebf55e85
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/strik?utm_term=how+to+start+my+own+cake+business+from+home PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501804/normal_5fc7c09a17aef.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/1rjjcxl/boss_battle_games_online.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/sogudoxevogulogofifok7v659.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/xKijdNy/apple_maps_voice_navigation_ipad.pdfIn PDF document text
    • http://usejus.pro/339193415650fc9z.pdfIn PDF document text
    • https://jafakatulo.weebly.com/uploads/1/3/4/3/134353771/6701444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475715/normal_5fda81f59dda4.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/ZjhjcQ1/5724288082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_60635059bf8f6.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/ngehiS5/lasimabomupodisil.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/8213042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_600e22c38ec1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482406/normal_5fe1b4f7ea682.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5ffbc9eae5b34.pdfIn PDF document text
    • https://naxigekaserudo.weebly.com/uploads/1/3/4/6/134644932/a376dbd9c0.pdfIn PDF document text
    • https://fegoparowewara.weebly.com/uploads/1/3/4/3/134321013/xefewekarixe.pdfIn PDF document text
    • http://parhelifrl.space/how_to_get_damascus_modern_warfarerbscr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_60218f04d55ba.pdfIn PDF document text
    • http://help-business-media.com/wuwimasabunuporowafox8asor.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/wupuxus/gedevitijisesujogubix.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/pupuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/98801505955.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/deradononer.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_off00016713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16713 5448 bytes
SHA-256: def08ace1db2c2b877ec86f1910ae5bba1e9ad801454ca52394244ecfd97d21e
font_01_sfnt_off0001798b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1798B 11352 bytes
SHA-256: a6028db5e403e888195f3ef372167959e1e0e38b8cafc6d05e67da90007ea5a3

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