Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c205fce5f68894…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 12:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fa3ec6368c4cc1e00b42f159f46b59f SHA-1: a71f1ee59cc09b7cea032d835e854fb0291fc40b SHA-256: 94c205fce5f68894bb886f8a39807c2790f0d9b109a668b0f1fbf256ede676bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=send+free+sms+worldwide+without+register PDF link annotation
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/28712e3514db32e3b02cf756d0ccd9f0/xawozavegon.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/30945711212.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/vosizegevubulipa.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/22154275205.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lolutiji.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/vobavigumalidiso.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/woferuxefaxusuzikopug.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/pisapilufizowaxeriw.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/58637612405.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1370422884.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/novoponiwelolevixosemifux.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/94752373098.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/67642057128.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131705108bc3---12912800869.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/vitukosuluwemiripulisobap.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/fomarutoxoze.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/77188250690.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/lesuvadoposebo.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/xuxulokenawobapixenejat.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/66816782884.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/pedunabopukodulu.pdfIn PDF document text
    • http://m2m2design.com/userfiles/21871948704.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B2 10900 bytes
SHA-256: 74e246f69451cfc90ce873a5233bf53eaee9c072e72af8918cd54e2d875d39ad
font_02_sfnt_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 17464 bytes
SHA-256: ba7791a0cafe95a91efd9ad02b9936b3b581863a8ca2dd04608c8a25dcb4772c

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