Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac749d8fd6c23fb8…

MALICIOUS

PDF

75.5 KB Created: 2021-09-21 01:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb4ed4b5b0bff60bc19d0a3f66b66b79 SHA-1: 9d4a12e282ec6f53cad93c74eb57fd214ef6ffcc SHA-256: ac749d8fd6c23fb8c46d3fe72dfff6fa4465de2f6683aff2207c67859edac746
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics further supports its classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=run+hide+fight+full+movie+online PDF link annotation
    • http://andreevka.topmebli.com/content/xuploadimages/file/61130650497.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/51011996997.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/luborigofuxewajiva.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/sofatenekofimeraxovedu.pdfIn PDF document text
    • https://scalping.ir/data/files/file/97159644713.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/badigokisowadezololewubif.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/jasutazov.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/1894735413.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109122036515824.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/nisafeganaxajesinulorax.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xopasevirosofuwase.pdfIn PDF document text
    • http://24cvety.ru/upload/files/55582194773.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/9405167420.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/92151143993.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/89874245191.pdfIn PDF document text
    • http://eko-uklid.com/files/file/49497568060.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/93859172525.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/79943031396.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/97962628150.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1b697f2c---wofofujiwuw.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3q953uu0bavvrgh51lq6ui5t30/jamaxed.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/tatasakegeweduxizuwu.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_off0000c391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC391 17312 bytes
SHA-256: b8e6a4eb1461794590ec8dd2ad7b04438668c01426fde3b85cc58dbdcbf0e4b7
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 10584 bytes
SHA-256: d5898194b1c7a7926b43cf600d316c2078c9c198c1382e5f9476482db65250d2
font_02_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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