Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5a70db0a0cc7d9…

MALICIOUS

PDF

87.5 KB Created: 2021-09-14 11:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 280a9df2c6cdd79b5afa414d1c569bc8 SHA-1: 793fa51a45185fffee0db329b702e6a85cb38c88 SHA-256: ba5a70db0a0cc7d9836092b224c68c07c86a12eb4bc151fea65b20513e7d6d29
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=icon+application+android PDF link annotation
    • http://dspec-car.com/js/upload/files/vabut.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-9/20210909005333287819.pdfIn PDF document text
    • http://velisend.ru/photos/file/33435359217.pdfIn PDF document text
    • http://szwygs.com/upload/94165454618.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/42052541386.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091016113594.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/0fed9f576314c8886be017c2b654b571.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/73044662367.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/45312369445.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/16646524209.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/keledugumuxavelikozifoxok.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/vupibebiviwapojoreb.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbbe70c946---kewexotijuxejuzivezedato.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/xipiwewapupavaxerosanuti.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/3967194279.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021971522572532.pdfIn PDF document text
    • https://seikai.jp/free_images/files/83111153546.pdfIn PDF document text
    • https://rubfila.in/files/file/35301319605.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/99372065026.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b128111251---69572282837.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/zimalipotalamusojep.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 10156 bytes
SHA-256: 3c220a692accadc7727933eb9d54b355341fafe37eddb71f1ce9b94ea5b193f2
font_01_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 17856 bytes
SHA-256: 3c64f1fb701a33a86b552599e194b3d050d257e6dd2915e96edb2808ac8b7859
font_02_sfnt_off00013883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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