Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1a644c24e104ce…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 03:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c9fcf88527e1aef6a80b6a5b5609b51 SHA-1: 078d8bf38bbde179194d9a286dc72bdfa13e905e SHA-256: 5b1a644c24e104ce54cd91940f318913a6c800465c92328c511943ade3e8cf64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute or phish via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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://projetovm.com/uploads/files/kimorinatimenojib.pdf In PDF document text
    • https://stopserv.ru/files/file/fudagedopupumeg.pdfIn PDF document text
    • http://huefpdf.org/upload/file/dobibipebemamojabidasura.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/11883231206.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/51779464248.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/dikixer.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/78161224549.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/mipaneb.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/30349227968.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/fabovoverez.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/daxuwopimufuvezi.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/muresowoxe.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/74539927956.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/13417294620.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/davisodisizadug.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/bozozewilamuvezagulawevu.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/50597243633.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/sojuvelorivikosifavoreral.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/tofotozosakoneboj.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/37817088320.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/jagoxunoxanegiwo.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/orh4r5qd7albnujaikfjf7did6/suleneguzar.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/37851146915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=classics+illustrated+comic+books+free+downloadPDF 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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 11088 bytes
SHA-256: 92fad584b568bc3966c12b2307679dc2929cf4b0c0807fd2f77ec0e8af86bfb9
font_01_sfnt_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 17424 bytes
SHA-256: 52ac3e05fc1fefc8bd4fb349c24c82c81af3a9ac5120df6a6c5da21366b41a69
font_02_sfnt_off00012459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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