Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db8a9aaa7d7661f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 17:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef7d1cc17804e3ac77ab89dfce167fbf SHA-1: 8651e06260141e4e2e0117218c390709bf478ef4 SHA-256: 5db8a9aaa7d7661f7e825f0296b05f28cfa87fc7701d55f25f6dd2e29c73a0dc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to link farms or disposable hosting, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely intended to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://linza-market.ru/upload/files/kojowunam.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613445fccb621---60168186383.pdfIn PDF document text
    • http://dr-temt.ru/images/file/2800853302.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/56558179758.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/93858114905.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/51802565090.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f72c680fcb---dololuvake.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/18076454274.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/mutilurorazeg.pdfIn PDF document text
    • https://tomas-music.com/contents/files/bujobimekikesevurowiroki.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/nofutadobupagezadal.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/sepawimiwoferij.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/narixodorojosaduxok.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/sazam.pdfIn PDF document text
    • https://defi128.com/userfiles/files/46726055659.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/69776422271.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/44033072560.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/kozalewip.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/tufegeluxiwunemi.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/66529205142.pdfIn PDF document text
    • http://wamer.org/userfiles/file/44638240978.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/tejodiwisenubolib.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/pisekikag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=topfollow+app+mod+apk+unlimited+coinsPDF link annotation
    • 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_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 10920 bytes
SHA-256: 2b1c8e49788c6c73ac9664a1f7a27feccecec2e26101191b568e6893d1dc913b
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 18252 bytes
SHA-256: 3ea625588ef0224fc508e7b62f27e624155745d87e3422c09500eab0c44c980a
font_02_sfnt_off00012f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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