Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31ffe93cc2044ca…

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 07:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4e0a7e4619ecebef8dd0f9127ed0769 SHA-1: e630fad80d8790cd9e97fc25e8362778761e4212 SHA-256: c31ffe93cc2044caa43f233321a099addcbf9a6e4d3264c50b8cce767eca8a7a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm designed to obscure the true destination, likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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 http://robertoantoniz.com/resources/original/file/81279794689.pdf
    • http://liveranigioielli.it/userfiles/files/47687963042.pdf
    • https://rewaqousha.net/userfiles/files/vamipimolaninikegojigaxi.pdf
    • http://urduhadith.org/survey/userfiles/files/50931516283.pdf
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/99274584936.pdf
    • https://kemxoi.vn/app/webroot/files/images/pages/files/pukuvunimanidetugiji.pdf
    • https://graphicart.ro/fckfiles/file/39841770399.pdf
    • http://jnejendomsdrift.dk/userfiles/file/dodexodisapoge.pdf
    • http://zabradli-znerezu.cz/userfiles/file/newonopezawiwavonupuja.pdf
    • https://livermore.com/wysiwygfiles/file/gebakakoxapat.pdf
    • http://maihome.hu/admin1/file/vibitekegepurunowaram.pdf
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/kesekeni.pdf
    • http://allefrgycg.news-read.com/upload/files/19521829141.pdf
    • http://tandartsindex.nl/images/uploads/91957005888.pdf
    • https://fizjolech.pl/userfiles/file/62938926913.pdf
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/5958350275.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/45039509075.pdf
    • https://dascalita.ro/app/webroot/files/userfiles/files/zaxusumi.pdf
    • http://www.gesas.it/media/mailinglist/file/lenexusi.pdf
    • http://honyi.tw/ckfinder/userfiles/file/dujilixesirulizavagas.pdf
    • https://nusamulticentralestari.com/Uploads/userfiles/files/kakunimej.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/satenabigikaxufosu.pdf
    • http://billedbutikken.dk/articlefiles/file/17197202770.pdf
    • http://www.anaja-inter.org/public/file/doweriguvuzugesogijojudul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+remove+contacts+from+favorites+on+android
    • 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_off0000cf99.bin
d98fe3432ba123e6ff11421d8b2cdf50335d618b929784aadba550ddf328f55b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF99 17192 bytes
font_01_sfnt_off0000fbed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 16792 bytes
font_02_sfnt_off00011404.bin
91964ac49803f586407d82cfeb20ccbd1775dbdc9f102cb1c6e6daa4087ca46b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 10732 bytes

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