Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd871cf4a22ea27…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 09:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae37b4c6ff64d0a3766c1dc0c8453993 SHA-1: 3c3d085b525457a8685fc0c1db834df6d8f6a4b2 SHA-256: ecd871cf4a22ea27b1b8a99407ca6b5cbc447c642c56a2d61b899d3b543239e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=what+happens+if+i+disable+android+accessibility+suite
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/baxoxuminotafigomadekezo.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210912233137.pdf
    • http://studiotecnicomartani.eu/userfiles/files/xomuvizapemuxoxuwuvareb.pdf
    • http://www.dilipprabhavalkar.com/images/file/rumavobidokewabemevekibul.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/f1mc8nslpqnkdql4ru9irm930v/sapuge.pdf
    • http://altus.pl/userfiles/file/wawopadexunijatufobafa.pdf
    • http://bjyhyy.cn/filespath/files/20210914052010.pdf
    • http://khangvietdn.com/uploads/file/mevixekudenabasire.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/zobototuva.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/63341520604.pdf
    • https://ingatlanfelugyelet.hu/uploads/file/fijifizebujejokokusuki.pdf
    • https://radiosmile.hu/upload/file/lipiwijig.pdf
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/fobujemo.pdf
    • http://apsons.eu/files/file/nujamuresira.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/lexikefikejojisuvuvit.pdf
    • http://heimundsicherheit.de/userfiles/file/xikebora.pdf
    • http://happinessgown.com/upload/users/files/zupitob.pdf
    • http://komodovo.ru/upload_picture/77322829260.pdf
    • http://ekotop.eu/userfiles/file/xokefedeju.pdf
    • https://dafelia.com/files/94471209102.pdf
    • http://pijntherapie.be/uploads/files/10738629245.pdf
    • http://luyutea.net/v15/Upload/file/202191694828599.pdf
    • http://xetaihyundai.net/upload/files/zafovuworiw.pdf
    • https://servingltda.com/userfiles/file/pugaxikaxurape.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_off0000c14f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC14F 16792 bytes
font_01_sfnt_off0000d961.bin
aa1c3a09716aba9635d0842b242c444f89fe22ee122b7517ee3663bea5ee55f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 17828 bytes
font_02_sfnt_off00010800.bin
2f47221b720f9cb2c65f74c73c59135830062d7e194827a3872fd4f5df1b272f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 11064 bytes

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