Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd557f6f73cbdcd7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 17:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 844abdbd960216f17858ed4b3972c730 SHA-1: 8dadc226a054a928f19ff2ff2d91132eae066078 SHA-256: cd557f6f73cbdcd740b9fd3a18b684585a2f1e94b39d9dabe6794be1bf2a1fa4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs suggest the document is designed to redirect users to potentially harmful external sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://arabic.cz/ckfinder/userfiles/files/3320689457.pdf In PDF document text
    • http://retrofitoman.com/ckfinder/userfiles/files/nafojajamilusiw.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/92026963486.pdfIn PDF document text
    • http://sb-78.ru/files/file/netige.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/53153726490.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/nisapinamejupeba.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/wuwis.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/sekesolafemo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9d7e7d38---79027060438.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/lezudogevokasi.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1b633da2d060690d77b528eff6b0d246/16872869821.pdfIn PDF document text
    • https://equimat-cheval.fr/file/13303786988.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/kereduvegizenexilujupiwe.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/zetexanujuxesosimutas.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/rikerek.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/bukotuleduneratonixapasa.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/17869112423.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/tadabasoduz.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/gigobofaratuwuv.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210909_132236.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/pidaxepinemogupig.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/ropokuror.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/63997637171.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/rixamiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mock+location+android+9PDF link annotation
    • 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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 18368 bytes
SHA-256: 6afe1a1ff5047dfdb6be5192f5516e7af79fb7147ab3c06690a8771a9bf89072
font_01_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 10316 bytes
SHA-256: ec62947420d2286b2dbff9c65637d34621a8158e22f842adc0fdf203c7378702
font_02_sfnt_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1