Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc57c1ba096f7e5…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 00:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c37f14349682c24e85a7cc4e0e6b5a0 SHA-1: f3b11577731b17416427aea1e55a4e2d5a5229fc SHA-256: adc57c1ba096f7e5076bfb08e27f95a0947094d71e448173bfded374eff24977
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to unknown domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is used as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://florerialafloresta.com/ckfinder/userfiles/files/12427096809.pdf In PDF document text
    • http://ourconn.com/userfiles/file/202109020053076315.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/82002735507.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/nufaxirodo.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/gilojakuliripak.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/lakitukenamotevawupa.pdfIn PDF document text
    • http://rc-modeller.se/images/file///55913116057.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/vomuru.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/23524304014.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/36210593463.pdfIn PDF document text
    • http://schokofontaenen.de/idata/zulux.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8c54c73da3e386e931fa72f77352a20d/46385308604.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210919050004904.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2a36a91ec---19881547236.pdfIn PDF document text
    • http://sdds.be/userfiles/file/kujibatajonumumoru.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/vopubemajijasuzumefije.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/pekavujegululiw.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/pofaridixamusoxokud.pdfIn PDF document text
    • http://greenglobepms.com/uploads/nojubaxidirujegi.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/widoselaj.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/39441115110.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210918080027_3dgicl.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/paligusolesofaxuwasami.pdfIn PDF document text
    • http://lactopad.com/uploads/files/36397102048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cooking+fever+cheat+enginePDF 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_off0000b955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB955 10592 bytes
SHA-256: c341552ac9415f8cbd0626c00d58150498f6c531f6edd7e30fb04bcc6c3d468f
font_01_sfnt_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 16916 bytes
SHA-256: 6caef4de6353385c9d10dbccb768c3c8acced1d3dfc612b46c4e3b570a4079be

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