Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94c5e92e3e3e02e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 11:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 005585c364679dd172bcd2bf5ad5685a SHA-1: 38bc98bec4a25976d55dbcd87e64f463b0d49715 SHA-256: d94c5e92e3e3e02e459d55481547a7ce6b2c2d0941304e0787e3999473b372b8
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest an intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=motor+world+car+factory+android+cheats
    • http://ekorob.pl/userfiles/file/77777214329.pdf
    • https://kocarbonag.com/luutru/files/zenavobabewixig.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/vumotikumagelip.pdf
    • http://abwcolley.com/uploads/files/bugisa.pdf
    • https://www.sistemkabin.com/ckfinder/userfiles/files/rizovituzivepopuwimeg.pdf
    • http://classicalgardenstatues.com/uplds/file/xosake.pdf
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/fepifovapuzataler.pdf
    • http://www.39koratmachinery.com/file_upload/files/80156834330.pdf
    • https://curtain.jinware.com/upload/files/94760901933.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/xelabumurinitoxosixexubix.pdf
    • http://dorp.pl/userfiles/files/9667628859.pdf
    • http://romento.com/uploaded_files/userfiles/files/fujozaniginewuvubuzuzezo.pdf
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/95822513698.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/4812082456.pdf
    • https://peptidturkiye.com/ckfinder/userfiles/files/jufiwajeluruv.pdf
    • http://dierenwinkelindex.nl/images/uploads/samovusumubesudarosuno.pdf
    • https://pasationtravellers.com/root/FCKeditor/file/35087704006.pdf
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/kazisidalapunit.pdf
    • http://kiddeefire.com/media/userfiles/files/venapajezefibelopal.pdf
    • http://lapawan15.com/shop/fck_file/file/41283681562.pdf
    • http://jsdarvin.com/files/busilepupulekew.pdf
    • http://royalwedding.jp/images/blog/file/laroxa.pdf
    • http://amindoost.ir/images/upload/files/84872757176.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac28963da---37727589163.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_off0000d2d8.bin
763b74b5b2a7fae20a848a78bc51a3cd7634296fea6ecf4bb012ea485cbeb658		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 10768 bytes
font_01_sfnt_off0000eb9e.bin
87df0640ca805a1c5617d5eea2e032a573c7cfcb8666c56151f237e9ff74e731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 17484 bytes
font_02_sfnt_off00011908.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 16792 bytes

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