Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eebcb1102c150bb…

MALICIOUS

PDF

76.1 KB Created: 2021-09-25 11:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6068fa9888f35feaf971b8c0f89288f9 SHA-1: 54f893143b346217feb84002c14d55003541513f SHA-256: 8eebcb1102c150bb3c84f43df58742dbda0f40654dc1c4137938403ce0397a9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment, likely leading to a malicious website or further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://allytemp.ru/uplcv?utm_term=theaters+near+me+playing+mortal+kombat
    • http://drivingschool-brno.eu/files/sewifawijeferurinenusumuj.pdf
    • http://lifeline-sports.com/files/file/gisuxi.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b0656b88---91856447550.pdf
    • https://diarch.in/WYSIWYGImage/file/73473919498.pdf
    • http://vswet.ru/f/89481963055.pdf
    • http://urduhadith.org/survey/userfiles/files/15526933088.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614070fe93b8f---gejeduvinowuxewofilulipur.pdf
    • http://mitroc.com/userfiles/file/38458930598.pdf
    • http://dlzj.net/upload/files/20210924121101793024.pdf
    • http://altadirezione-consulting.it/userfiles/files/bokanavegifoto.pdf
    • http://whipitleather.com/userfiles/file/tones.pdf
    • https://condominiovillage.com/userfiles/file/42846920757.pdf
    • http://celeb.huh.hu/UserFiles/File/33286734297.pdf
    • http://sonarkella.com/userfiles/file/magajezofidajukobawovoxot.pdf
    • http://euroteam.vn/ckfinder/userfiles/files/60910770080.pdf
    • http://www.dilipprabhavalkar.com/images/file/37674589466.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/7778149238.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/36857473958.pdf
    • https://stormester.no/files/file/71108176231.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/42703224580.pdf
    • https://altsovmun.ru/userfiles/file/16911541810.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/dedorupiduxifezopi.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_off0000bba1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA1 16792 bytes
font_01_sfnt_off0000d3b3.bin
fc630b5a083c94f2de6d4667ab6e61c33fcbec283fa23ccb08a6b96f848fe6e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 19764 bytes
font_02_sfnt_off0001080f.bin
781de4d07c4a71a40a6a66215683e22f0737783d8a9fcc0f56cb392ae7915f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 11008 bytes

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