Malicious PDF — malware analysis report

Static analysis result for SHA-256 04529381308aa89a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 02:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41e875f566ce21096b2b53a1122adc5a SHA-1: e0fb8cea7f5e27aac52d4c0bcf3a061a69862e75 SHA-256: 04529381308aa89a5e6afe39193f4969f1e90516faf5ecd913ed4a5709cf6a16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. No scripts were extracted, but the presence of many external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://allytemp.ru/uplcv?utm_term=watch+moana+123
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613115cc0db09---palufe.pdf
    • https://daaeportrett.no/upload/file/rowodipupojedulamafib.pdf
    • http://zezoalza.com/ckupload/files/wuxowewatijixigix.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/nekabojimerububona.pdf
    • http://splhardware.com/UploadFile/file/2021090909210373499.pdf
    • http://skkl.cn/filespath/files/20210913064359.pdf
    • https://inverpalmas.com/aym_image/files/gabogijozeganatobijijusuw.pdf
    • http://yourhandmadeitems.com/userfiles/file/84797047724.pdf
    • http://global-leasing-management.com/uf/file/fetunalub.pdf
    • http://www.reeder.ee/files/filemanager/sigat.pdf
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/gujusax.pdf
    • https://naucharts.com/ckfinder/userfiles/files/fomevaxoxumuwoja.pdf
    • https://caraudioshop.ro/mm/file/17462249016.pdf
    • http://technocom.pl/editor/file/17514520857.pdf
    • http://gardens-spa.com/user_pict/file/susevifidokizimom.pdf
    • http://dasbluemchen.com/potek.pdf
    • http://ballarioarchitetti.eu/userfiles/files/54875410368.pdf
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/jopisoga.pdf
    • https://wic-net.com/userfiles/file/tesukuninidosipigewiname.pdf
    • http://studioarchterreni.it/userfiles/files/82344049399.pdf
    • http://around-sicily.net/userfiles/file/95478165246.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_off0000ca97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 16792 bytes
font_01_sfnt_off0000e2ae.bin
e362588f2328f7f64b4920ec5c537de5548d32f2b34a0fdbc458e14c850af220		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 10292 bytes
font_02_sfnt_off0000f9d7.bin
250aca07279711e32c4d774620f1d1b25241a84765323e1c778513aa7cf5ac0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 18220 bytes

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