Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdec1d522f1325f…

MALICIOUS

PDF

84.0 KB Created: 2021-10-07 05:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 147a960b29d0ba7f01ba8e361ea18886 SHA-1: c8143e456224b20157204c91483eba372c2ffd53 SHA-256: 6fdec1d522f1325f6501b9887a24b06c0fe6f0da788fd92a88ddcbfe3d226aa6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=solving+linear+equations+and+inequalities+worksheet+pdf PDF link annotation
    • http://cameragiaminh.com/upload/files/6238468278.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/nopavapadezoku.pdfIn PDF document text
    • http://wohingltd.com/userfiles/45163745929.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210908193855.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/8310643227.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/nutufev.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/romuwelixeputim.pdfIn PDF document text
    • http://skomi.ru/img/files/file/49519333984.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/rifikanigufawenonuzum.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/20538031604.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/fosobafoseguk.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/75009456994.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/35113584923.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/65414153463.pdfIn PDF document text
    • https://istanajp2.com/contents/files/12492577638.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/jenirewipofaz.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef81e4b4e5---81576374428.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bad803169e---lekavinijewi.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/89093775177.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/dobeful.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/50745914451.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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 11344 bytes
SHA-256: a98c522193dca9a8c9520ea2954b67bd32d287b06d39c8bff313c0836aec14cb
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 18304 bytes
SHA-256: 47d55fac66a3b52e5a2ef4196dbdf359f097ea004ccf4acd044ac52f877479d5
font_02_sfnt_off00012a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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