Malicious PDF — malware analysis report

Static analysis result for SHA-256 44186d4791c2c3d3…

MALICIOUS

PDF

82.6 KB Created: 2021-10-10 10:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 524b58ab7df02767e24d6be01098f924 SHA-1: e7ee07a568418065bae4001d5b7c093e21c81a9e SHA-256: 44186d4791c2c3d389e222438e0948af503f15c51e82e4becf84b8e82d443983
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. This structure is commonly used to distribute phishing lures or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/uplcv?utm_term=umts+networks+architecture+mobility+and+services+pdf
    • https://debden.org/userfiles/file/
    • http://linza-market.ru/upload/files/75067059580.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367f7ded0bf---74794259886.pdf
    • http://honeystraw.com/uploadfiles/file/6186594668.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3b1538ed5cce3b2abb3eab62a8b7f5f2/30463158602.pdf
    • http://nfc-lampang.com/user_img/files/kuvawagosigafap.pdf
    • http://mebel-moscow.com/content/xuploadimages/file/loxowuboguxemowetok.pdf
    • http://mawratanews.com/armedia/uploads/files/beseloxi.pdf
    • http://risorsaterra.it/userfiles/files/97386900249.pdf
    • http://ipceurope.be/assets/file/livezuzonuxogo.pdf
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/wubefavijepolaganiz.pdf
    • https://zlato-eu.cz/upload/files/6114306805.pdf
    • http://www.taxivanclass.com/uploads/ckfinder/files/479803264.pdf
    • http://candleelectricals.com/uploaded_files/userfiles/files/19207234355.pdf
    • http://abwbaltimore.com/uploads/files/72698834052.pdf
    • https://vicotelecom.vn/static/source/images/file/52668841324.pdf
    • https://aurastaffing.es/upload/file/19247992412.pdf
    • http://lovepetclinics.com/file_media/file_image/file/94528821546.pdf
    • http://quangphong.vn/uploads/image/files/navomogavopewikujamapajop.pdf
    • http://clerus.hu/files/file/xipetelesebikiw.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_off0000d928.bin
e47e3f736b323d79ab7ed1ba761b4b98f5126d01127dd34161cc5497d566b651		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 18268 bytes
font_01_sfnt_off0001093f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 16792 bytes
font_02_sfnt_off00012156.bin
d674f8b53570cacf5c624fde260de18835ebf9c15d579a9dee3bbdf08ede3667		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 11492 bytes

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