Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f600956481f84b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-08 22:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48602582b87cc62f85c2a55dfced7c30 SHA-1: ede8159849dbfe43e457efaf0903ab4a400afdcc SHA-256: 10f600956481f84bc183dae4794cdc65b0723d9bc3c6d8b7bbdb32a40ba2617a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous external URIs, many of which point to disposable hosting and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=download+game+pokemon+xy+nds PDF link annotation
    • https://onutglen.com/caningest/images/file/44795613399.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/pikojoxaxamov.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/tisalejanijizuwilapaxabi.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/75241640158.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/11324152141.pdfIn PDF document text
    • https://capecoralliving.com/media/file/kupajejiv.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/gabazatuwol.pdfIn PDF document text
    • https://euchebnici.com/img/file/78719099327.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/wizipawi.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/maxukiwelifatixa.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/34948690733.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/sukobatafonasosotixexigiv.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/jerelu.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/52085551910.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/dixojobin.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/nukomunitone.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/78606478022.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/bexubawurejotaluf.pdfIn PDF document text
    • https://satesayap.com/contents/files/liseledajusi.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/pujerinosukezisefu.pdfIn PDF document text
    • http://iscelenie.info/files/file/20393432166.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/nezemovogiwef.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/62271295052.pdfIn PDF document text
    • http://exosushi.com/uploads/files/57235015046.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_off0000c302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 10840 bytes
SHA-256: 49fabc66c9d3f0f8a3b44fe4d8a1823beed6697ceeb9fe3f70f153e984703470
font_02_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 17256 bytes
SHA-256: 73bbd713010ac0179e356aa362c2ddf9719070f97a2a9e8fe9e98b86ec3a103b

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