Malicious PDF — malware analysis report

Static analysis result for SHA-256 864a0317b185a8a6…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 00:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 707b2d859344ac48732a75203479f104 SHA-1: c2f19b85bd0c38aed5f01734b4f112c5b59e5feb SHA-256: 864a0317b185a8a6bbefeb55a16c751cc588283476abb055c3aeb92a18834a11
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 heuristics suggesting it functions as a link farm, likely to facilitate phishing or malware distribution. The presence of external URIs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=best+app+for+sound+booster PDF link annotation
    • https://acrgruppe.de/userfiles/file/6305693096.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210912_C5E137C642B99863.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/nunivasujixodobisirimipa.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rotawutemanev.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/84095684836.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/14891242132.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/93152174060.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/54999575958.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/tikilabigodotulepob.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/labaxeg.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/98425363049.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/fatujewodexagexejewimemi.pdfIn PDF document text
    • http://ilkemymm.com/image/files/kexezimasevokaxi.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/vodunosinegokujotevos.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/17996375980.pdfIn PDF document text
    • http://pasted-radio.de/web/files/29911352026.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/93471554521.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/89024827865.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/gapalowolarolotonapume.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/xuwakiramewisavepunifozi.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210903073756.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/nigalaluz.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/tixupuvelenuremapagiv.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_off0000be17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 16460 bytes
SHA-256: 3285142878b10343bd1cab326105ff52e45cf641bd6ac02c47bca9158af3a4cc
font_02_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 10644 bytes
SHA-256: af81707a31ae29c65db507e8c8b33a3aa6c17d1b50f5849f668a598f7f90b15d

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