Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f23ee6e64fb379…

MALICIOUS

PDF

70.7 KB Created: 2021-09-14 09:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1d620ceb8fc3560c01d2c914fd1a139 SHA-1: c5836a0077204de71992cd22322d4b5b61d9a06e SHA-256: 51f23ee6e64fb3796e63760b2a42320008b766d38dee6859082ce0b85dc6b121
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://bbmeti.it/userfiles/files/fosobovafonorutugo.pdf
    • http://pusheng168.com/uploadfiles/20210908035409.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c335cfa7aa41055958270ef7203d3772/13274170049.pdf
    • https://ibrahimkoc.com/images/Media/files/pugulu.pdf
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/53024872739.pdf
    • https://chp-travel.ir/data/file/19073256081.pdf
    • http://monterroso-construpuntos.com/campannas/file/5798281553.pdf
    • http://ez-surveying.com/htdocs/cljr/data/files/54459099319.pdf
    • https://infiniteprospects.com/FCKeditor/file/69316260423.pdf
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zupolamonajokofaduzipif.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/vunofanexuwelewanotalubag.pdf
    • https://wspaperbag.com/userfiles/file/96498868769.pdf
    • https://avistravel.ro/userfiles/file/vowamupejezolavefozefuvil.pdf
    • https://keepingscore.org/userfiles/file/pazukijugiwibinogodowelem.pdf
    • http://paitoonbox.com/userfiles/files/wojawogifelozowekud.pdf
    • http://weiddy.com/uploads/files/202109050242137258.pdf
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/tipopanaduk.pdf
    • https://yaslibakicisi.net/userfiles/file/suloketexu.pdf
    • http://rosabaum.de/web/editor/files/57986965171.pdf
    • http://mishelik.ru/userfiles/file/mafadagutogopito.pdf
    • http://cn-daomeng.com/upload/userfiles/files/2b55dd4618089e359f5403bd1d9e930f.pdf
    • https://navoloki.mebel18.com/uploads/files/6540473746.pdf
    • https://nergizleryapi.com/image/files/62270101175.pdf
    • http://kmkonsult.cz/userfiles/file/17738922474.pdf
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/tuvutofuf.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/tivixedipubusa.pdf
    • http://etalentlink.com/uploadfile/file///2021090518103467.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c33b1df94c9280e56522013a3ef3b18b/zixub.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=video+time+lapse+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_off0000b82e.bin
2bda72675454a1bbf02c3767bd140e2651c596c901274f7510a16cd93f803498		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB82E 14900 bytes
font_01_sfnt_off0000dcf8.bin
b8e9868def154874362f85a53278b8f6f67ac8a1197164f86878a5e892cd597f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 10520 bytes
font_02_sfnt_off0000f4e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 16792 bytes

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