Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dc2ad606d22a1e…

MALICIOUS

PDF

73.2 KB Created: 2021-09-26 17:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b569de21d594737267b160c8aa4e8934 SHA-1: 26a525c0c2ddf7f3f8f2d545a9daf669d67987a7 SHA-256: 51dc2ad606d22a1e9f685d99bd70c504c9ba89199708fd9e89fe694db7de98ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, such as the identified link farm at 'inwebjor.ru', which hosts numerous other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a chain of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=asus+rog+phone+3+launcher
    • https://noble-program.site/js/ckfinder/userfiles/files/rofekegakezo.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140f8129d6b0---65572408566.pdf
    • https://www.jdconstinc.com/ckfinder/userfiles/files/funavisatogulujuzum.pdf
    • http://ekmeta.lt/failai/file/xejidawomufowitud.pdf
    • http://vom-ragnaroek.de/uploads/file/fasabawekufimelepesevu.pdf
    • http://feynburg-uhren.de/uploads/66792327706.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/56155471910.pdf
    • https://oncetrabzon.com/resimler/files/93532731857.pdf
    • http://playbabydoll.com/userfiles/file/fobavogovaro.pdf
    • https://smobiil.eu/userfiles/files/xevapitevidavepeminozosa.pdf
    • http://daiwavn.com/uploads/image/files/nezofojusegutefuneniga.pdf
    • http://morebricks.com/ckfinder/userfiles/files/lonisedomefosonofom.pdf
    • https://hotelmitrutarija.com/uploaded/files/13436621433.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202109071836526443.pdf
    • http://kooijobs.in/ckfinder/userfiles/files/80522228842.pdf
    • https://www.funes.gob.ar/ckfinder/userfiles/files/96763208588.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fafed6a4a6---5880868847.pdf
    • https://livermore.com/wysiwygfiles/file/dememosawig.pdf
    • https://qualitygums.com/userfiles/file/62086498621.pdf
    • http://aroma-es.site/yamituki-n/uploads/files/datokelizewuzedaxok.pdf
    • http://rideabikenews.com/user_img/files/78632097975.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/vositexibazumu.pdf
    • https://angkaganjil.com/contents/files/sutifakazegifixu.pdf
    • https://mallncart.com/userfiles/files/zovosukuragereminokuto.pdf
    • http://ahcxdq.com/uploads/file/09195349916.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b83e.bin
43573102ceceb70ae89a70c1dd2b20ff4288a69bfea4ad87097f38d350703803		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB83E 10716 bytes
font_01_sfnt_off0000d0d7.bin
9545b9a7ff49c84d06d8ceb93394402d5c1966822c49ecd057ec04b99cdd875c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D7 17824 bytes
font_02_sfnt_off0000fefb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 16792 bytes

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