Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ec7735e636dbb8…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 11:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cedae2d93f293d3abaa9e06099b1329f SHA-1: 1b1f546eaff0b4c3a618a6c7d88414208db069d2 SHA-256: 53ec7735e636dbb8385ee3486de0980b818257b9cd5088b63653938a4bb05988
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely used for phishing or distributing further malware. No scripts were extracted, but the presence of multiple external links and the high ML score strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fundacionecla.org/resources/original/file/pepudolinan.pdf
    • http://bckvalumni.org/userfiles/file/58799780099.pdf
    • http://guitarenko.fr/img/files/23186980426.pdf
    • http://cjmfgx.morefriendship.com/upload/files/85096334666.pdf
    • https://bonvoyageindia.in/ckfinder/userfiles/files/sazinaz.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/85677989426.pdf
    • http://autoscuolemontagna.it/userfiles/files/pugutobesez.pdf
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/defefi.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/62508244066.pdf
    • http://monteconsultants.com/image/upload/File/jabur.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16152d825bf2d1---83977116047.pdf
    • https://istanajp2.com/contents/files/losapo.pdf
    • http://gamax-motor.cz/data/dokumenty/15296626530.pdf
    • http://doks-films.com/pcms/content/file/96431292508.pdf
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/43860505682.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/66545188860.pdf
    • http://cataga.de/beta/files/file/milimoninatexefeb.pdf
    • https://webmenuplus.com/images/file/38408738265.pdf
    • http://beming.com/ressource/site-image/files/56016463277.pdf
    • https://pasarangroup2.com/contents/files/10637641694.pdf
    • http://upoart.com/ckfinder/userfiles/files/noxig.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/28742005882.pdf
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/82764183564.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=rom+android+go
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/59f75e79acc56f20918e881eb2aea182/sodotipibato.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_off0000b2c8.bin
1e8145084cff3f9ed051ff618c987cd77d68a67f3381e5a60cba458ecd7f0c9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C8 17716 bytes
font_01_sfnt_off0000e022.bin
766300f21678b20bc7f3252a838eeb47041aea84ffec75f26b6f7c04d71e04ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 10192 bytes
font_02_sfnt_off0000f6a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 16792 bytes

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