Malicious PDF — malware analysis report

Static analysis result for SHA-256 110785c70605744c…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 14:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a26c9a9e7cd20c40819c66fd16b5fe32 SHA-1: babf35a884a78020fc0f691122966880d7f5f1dc SHA-256: 110785c70605744ca0fb7dc81be97cfa1c94f8a65e586e083036c49fa5837be3
134 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous external URLs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=backflip+madness+apk+download
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9fe59da9a4e5aedbad4ecb0004cf0f4f/ligurarunemupup.pdf
    • http://altinay-law.com/images/file/wavazazamomesilexufe.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/koraxijuwa.pdf
    • http://files.ibiza-ferien.de/file/20901227268.pdf
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/ninilazikamozugan.pdf
    • http://asu78.ru/userfiles/file/komugufiwogadujawova.pdf
    • http://doradcyprawni.com/images/pliki/78336955614.pdf
    • https://adeptos.clevercloud.pt/images/items/files/80882868825.pdf
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/89921175604.pdf
    • http://phuongsen.com/img-chamthi/files/39176068535.pdf
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/61934000947.pdf
    • https://dcmheavyequipment.com/admin/images/file/75668174449.pdf
    • https://digireg.se/upload/lexososuwaxubig.pdf
    • http://www.propper-droppers.nl/files/file/73801242539.pdf
    • http://all-vehicle.net/js/upload/files/sidijovugugotunudabokutej.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1a6049f6c475ff6c5ba37e2f34bf501c/87128489185.pdf
    • http://vpecargo.com/userfiles/file/87141168026.pdf
    • http://project-lovcen.me/userfiles/file/53514809601.pdf
    • http://3m18.com/images/editor/files/jawisujufuzi.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_off0000a984.bin
9bb15f922f6fd6f4dcbf45f7afe1bb7549209d71a756b4e286d021dee54ba093		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA984 16216 bytes
font_01_sfnt_off0000d2ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 16792 bytes
font_02_sfnt_off0000eac2.bin
78456bbf203e4926f3efa792fafde6ba150b71be894312e73cf2f9e9c63c598a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 10812 bytes

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