Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ee6c4b54735a33…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 17:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37d852f87d31739eb16852107759697b SHA-1: b1fa740a46ecbfa60c70c2e0892113ecbdc997db SHA-256: 33ee6c4b54735a3303080397603c224afa2e0e1b3e45bab85896aedd72e4ecb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicative of a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the high number of distinct hosts strongly suggest a phishing or malware distribution campaign. While no scripts were explicitly extracted, the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://awinresource.com/uploadfile/file/fitatateralodenu.pdf
    • http://wieswioska.pl/userfiles/file/27052540178.pdf
    • http://pravkniga.ru/files/userfiles/files/ximaxajonivobitupuzuwatov.pdf
    • https://gastriklandsbf.se/UserFiles/files/56230104880.pdf
    • https://umiyawoodworks.com/fckdb/userfiles/file/70559654511.pdf
    • http://xatrbio.com/userfiles/file/34950197025.pdf
    • http://hitelesen.com/userfiles/file/85425848631.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e54ee05f40---50989247114.pdf
    • http://ckm-machinery.com/userfiles/files/najab.pdf
    • http://www.fred-robin.com/ckfinder/userfiles/files/75085709515.pdf
    • http://www.florentmaussion.net/userfiles/File/40705625544.pdf
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/14876023740.pdf
    • http://4x4autok.hu/userfiles/files/kuxamiziligola.pdf
    • http://mishor-uvk.com/uploads/files/wonovibenilopulamokibus.pdf
    • https://pasarantogel2.com/contents/files/jovegunufomibo.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d295e87f8---6727373673.pdf
    • http://www.moyekolodin.com/files/vawezafoperujaka.pdf
    • https://jackinthegymtpe.com/uploads/files/202109060307099000.pdf
    • https://oteaexpert.fr/cite_imgs/file/82033879294.pdf
    • https://revive.fashion/upload/files/vivemurozezumakazoziv.pdf
    • http://benly-carson.com/product/files/limatamarajefasig.pdf
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/siduni.pdf
    • https://konzolstudio.ro/uploaded_files/file/44121231275.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=set+private+number+android
    • 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_off0000d07b.bin
4098c57b6026b8d9de95b9bb4fb1b309948f34aab6943a078d7bdec1853c5869		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 19576 bytes
font_01_sfnt_off0001030d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 16792 bytes
font_02_sfnt_off00011b24.bin
a666e39010be94a677a9e85b5dce3efbf585dbecd98037b73635849591938463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 10720 bytes

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