Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b1e95c1ea2052b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 17:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5184ffd0cbca2462382c1cfb00997d09 SHA-1: f6de41110469d05b1c0f09cad28b85041116aaf4 SHA-256: c4b1e95c1ea2052b2e852005c2cf762b743159badf485a5d093435a3320c8649
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm designed to redirect users to download potentially malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=scoompa+video+maker+apk+download PDF link annotation
    • http://worldwidestationeryholdings.com/files/file/robirap.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/paxanilomutef.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/gakopugovenofuloxutonog.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/70641726562.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xepakamekowulakutato.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/geniwesiwilod.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/44837025554.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613284e464464---21113866899.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suzuxiwifosudenuzawe.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/28371725043.pdfIn PDF document text
    • http://elitvorota.ru/f/file/61783049960.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/mofokem.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161446710c8506---tunilitutirakelelosogelo.pdfIn PDF document text
    • http://quranday.org/userfiles/file/vunabudozetur.pdfIn PDF document text
    • https://fond.ru/userfiles/file/60933804446.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/65691653426.pdfIn PDF document text
    • http://spbi.cz/res/file/dejoxunazulomowogumiri.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/93392710978.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/25402633655.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/96377647616.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/gevuwirutojomudep.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/datasefevawovevur.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 19192 bytes
SHA-256: 61640258cfe90bf9376a7148637b33e773b82a7c7d77d2702c64ebb99f8378b3
font_01_sfnt_off00010c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001241b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241B 10728 bytes
SHA-256: 5439c80f888da45350e92ce3d232ec4a9ae0c102d03bc24af9807aff24a09094

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