Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1c7204f5a3e186…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 16:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef8176c4080152688e915e8e5207f565 SHA-1: 5bf29702a08ea1cbc6f441210b705bcb92290b46 SHA-256: dd1c7204f5a3e186d798f8eee296dcf20b4fb8d53ed3d157a4aac26295b58d5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it functions as a downloader or redirector. The PDF structure and embedded content are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=top+offline+games
    • http://www.farmaciapenil.es/userfiles/files/84779906949.pdf
    • https://habibitoursegypt.com/ckfinder/userfiles/files/61935402147.pdf
    • http://utpcomp.ru/uploads/files/55852033123.pdf
    • http://yule-sign.com/upload/editor/file/20210905183155.pdf
    • http://edituj.cz/res/file/70617207800.pdf
    • https://immo-macedo.lu/userfiles/files/fixejiseninujapakizipofe.pdf
    • http://delfosventures.com/userfiles/files/nomoguwesu.pdf
    • http://jnnycc.org/userfiles/file/18742790756.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/48926528220.pdf
    • http://kopdesign.nl/userfiles/file/zumomabozuxeduko.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136b42a0fe7e---zopemaroridodusu.pdf
    • http://millecolori.it/images/file/79544172912.pdf
    • http://egitara.com/upfiles/files/luxigunupete.pdf
    • http://logicparcel.net/uploadsEditorfile/80014315335.pdf
    • http://kiuanai.com/userfiles/file/gadaxipojigufope.pdf
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/6170547740.pdf
    • https://questyme.ca/userfiles/file/41910479677.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6c2f30cd837ce4a06e633027f4a91345/81013868004.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe20ff2ef2---zewawenufatavurasenog.pdf
    • http://westfallassociates.com/documents/file/kavisokupewoxinedizulupe.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/1334783129.pdf
    • http://shortguycentral.com/ck_uploads/files/xigiwitofovapovi.pdf
    • https://stef-nancy.fr/upload/document/31891405151.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_off0000f126.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 16792 bytes
font_01_sfnt_off0001093d.bin
8b0a490c99bf64b49c4f1cb93526df81e057adcb6e1a0acf12195ad4134f1e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 10468 bytes
font_02_sfnt_off000120f6.bin
af3be49e3b0e7e43be68cd25cc54d0a5d30a8a9f5484501feb9e827232b8da3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 17316 bytes

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