Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a0e73c3e7afaa8…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 14:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68ceddb97a1ae9737bcb572f42895723 SHA-1: 3f3cf9a78572e4621b8ee6a00db5f4af939fe74c SHA-256: c9a0e73c3e7afaa82c383020c0562519b3c7bf903aa560e7ce9fa0d525a9f893
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of disposable URLs, indicating a link farm designed to obscure the true destination, likely a phishing site or a download lure. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing campaigns.

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 http://studioriboldi.eu/userfiles/files/65531929175.pdf In PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/22437479513.pdfIn PDF document text
    • https://vzglavniki.net/data/file/85882769474.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6083ef48c---92283117348.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad6345661c---61762562923.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/49850473970.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/20781609894.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/5307280616.pdfIn PDF document text
    • http://hidramaco.com/files/files/26858213925.pdfIn PDF document text
    • http://vaynhe.com/upload/files/40040549944.pdfIn PDF document text
    • http://szhlfz.net/upload/28031985255.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210903014650.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/68670152158.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/81713135519.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/lobaririgajij.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nibolimuzorutuxalo.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/nofosixukubufawu.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/78723955284.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/67743144465.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090508555273499.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/donak.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/tozawizigexarovat.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090412504173499.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/89034880323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=furby+connect+world+app+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_off0000c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 16720 bytes
SHA-256: de971226a00857d0f77db9d3b70e762aa848ef7eea71a1d2dbbaee0feaaef9d8
font_01_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 10664 bytes
SHA-256: 46cb82b646dae5840d557590afeaa3858c688bd0c1b3d8d939783a840c0d079c

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