Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b590f737b048cbd…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 11:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f905d1fc87397328b9d3164feda57f38 SHA-1: aec5d9ffbdb8335645a14453e0013b0a209661fc SHA-256: 3b590f737b048cbda1ff2d2ce6fa45a7baece380c8a66cbe9a5394f6ef8be447
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document 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 presence of embedded JavaScript, flagged by heuristics, suggests the potential for malicious code execution within the PDF. ClamAV detection and ML classification further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://garglob.ru/uplcv?utm_term=legend+of+league+mobile+apk
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/98082205361.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea3f6c18c---tizumewebuj.pdf
    • http://giustizianuova.it/userfiles/file/87656942237.pdf
    • http://maychaybocaocap.com/app/webroot/uploads/files/73013933722.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b7e52372168eccc6a811c21d7d6d354/30084163455.pdf
    • https://bimore.vn/webroot/img/files/94486550139.pdf
    • http://digitalpolicycouncil.org/imagenes/file/zikekafij.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/werunanimepo.pdf
    • http://sissonne.hu/editor_up/tikabino.pdf
    • http://mastervin.ru/files/file/nuxinitolujazufomu.pdf
    • http://lavalnerina.com/userfiles/file/49368574425.pdf
    • http://instant-image.net/UserFiles/Site/File/8790935404.pdf
    • http://vntattoosupply.net/uploads/image/files/46202519210.pdf
    • https://sananselmo.com/wysiwygfiles/file/5025393947.pdf
    • http://korvet-sp.ru/userfiles/file/ranaxudexapewo.pdf
    • http://ventensis.lt/public/ckfinder/userfiles/files/zirumipuzuwo.pdf
    • http://klenderbio.com/upload/files/87310318925.pdf
    • http://gayaarchi.com/userfiles/file/20210919171710.pdf
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/74935597772.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/9261520215.pdf
    • https://halead.com/uploadfile/1630818048.pdf
    • https://codecs.ro/images/file/18248370871.pdf
    • http://www.gobarging.com/uploads/textareas/file/53989912690.pdf
    • http://ndt-tl.ru/upload/file/mirulaketaxiwufubobilo.pdf
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55972337539.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_off0000d001.bin
b7ae371ece69319ac0ee93b27b9404db4fa9c235b54427fcde18d09c1c72cd9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 10764 bytes
font_01_sfnt_off0000e83c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 16792 bytes
font_02_sfnt_off0001004e.bin
7a84ad1988c0936de773e3b73c8d59009546e8f6d0b31d7f9f90f0211d683ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 20168 bytes

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