Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecd9fa3c53ded45…

MALICIOUS

PDF

81.2 KB Created: 2021-10-15 18:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 70265c986c0b959c1bc9a52941d6770d SHA-1: f91ca7b44fef5cb6d186bed620c7a4d42d31302b SHA-256: 7ecd9fa3c53ded453d97bab7bdf7c948139103dfcf2c5771a7c2fc4e618ad549
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

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 http://kwartetproforma.com/userfiles/file/56855517555.pdf In PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/xepuki.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/gogivupajo.pdfIn PDF document text
    • http://tulga.ru/editor/files/66450110006.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/xexuvapekolorefus.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/93251794417.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/bedewusefur.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202110091420328726.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/juzugokudedimijebitevara.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/85086404562.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/gulugizep.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kidomovakoxajafes.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/33058837220.pdfIn PDF document text
    • https://robodom.si/files_vsebine/73026567838.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/dekogipawapezaweju.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/89476072955.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/zakedevamubalirujusi.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/20422855197.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/95633273624.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/44965591041.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/lupunujonerogetodudubi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=iso+9000+quality+management+systemPDF 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_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 16180 bytes
SHA-256: 3767b4fc53a9ee513e7a8e89841a5efa6df11b38e45172535375ab3c1109fb7d
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 10952 bytes
SHA-256: ff785932d91214fdd086abd2046f59918b5ac5a3644915461519798fb747bad4

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