Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e49ae9f0a23976…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 14:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fe66f0ef251e24cb46c34e501c8744c SHA-1: 3b072f9b3eb94710e11e9b75512669bdb7a17c6f SHA-256: 68e49ae9f0a239760058a566932310d2f2220aa95ead3e54b00b50317ed0dadf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, with one prominent URL being 'https://cructi.ru/uplcv?utm_term=download+wobbly+life+android+free'. The PDF structure and the presence of multiple external links suggest it is designed to lure users to potentially malicious websites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=download+wobbly+life+android+free
    • http://packamate.com/userfiles/40396194624.pdf
    • https://mepho.hu/ckfinder/userfiles/files/naburo.pdf
    • http://jatechkj.pl/upload/fck/file/tojewaduketadofome.pdf
    • http://www.jokilaaksonratsastajat.fi/file/56742840983.pdf
    • http://kaiyudachem.com/filespath/files/20210911055004.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/bepumesapefat.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/sixisiri.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/86706664049.pdf
    • http://tehnicgaz.eu/files/file/kotipagudaren.pdf
    • http://riccaassociati.eu/userfiles/files/zegipubofof.pdf
    • http://giayviettri.com/img-ftec/files/vasonebevoguzemikitu.pdf
    • http://kunbot.com/upload/files/taxofujuwitugevipago.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300970397e2---4514211591.pdf
    • http://www.pattyn360.com/upload/forum/files/83913420681.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/90569914671.pdf
    • http://proreferee.ru/uploads/ckfinder/files/wemorurifufasunop.pdf
    • http://tnslib.tools/userfiles/files/66725793964.pdf
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/82357857442.pdf
    • http://hyunsin.net/userfiles/file/zupax.pdf
    • http://baaningdoi.com/file_media/file_image/file/wopogorolatu.pdf
    • http://alarcon-v.com/editor_upload_image/file/xerukirizogidojuxe.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/wafanavelajidotipimo.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_off0000caf2.bin
3c72d75877e0adfbac4cef535e5ded651c9c6e37ad90a1c8220ad71a359d1d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 18040 bytes
font_01_sfnt_off0000f9d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 16792 bytes
font_02_sfnt_off000111ec.bin
88b63279c687d8ab78f0684a96e1285a5c1736c4c4a6d97241d1c1a3b645976f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 10420 bytes

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