Malicious PDF — malware analysis report

Static analysis result for SHA-256 754a8cc67cfbd6ca…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 07:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06133091a3761a17a4f34f6b4cc245f5 SHA-1: 2976366483e5953c053f44d96746fabe21184a22 SHA-256: 754a8cc67cfbd6cabd4d70af757263d0ec12162cd24250e59bcce6163e83f250
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown reputation URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=webview+to+apk PDF link annotation
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/gitalejudofezubokexedakom.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/51269799665.pdfIn PDF document text
    • https://msiutilities.net/documents/4450298775.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/39896873477.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210910015750490.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109161801559972.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3cdb3f293---24707328117.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/losurudoxoki.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/loviguxa.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/tawatunojudetu.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/89388057487.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gegowoluz.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/13366436704.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090716065147.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/99394609038.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/96056817514.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e036061672---marowubotibigofimib.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/6666521033.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/48613300256.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/kukejifujeta.pdfIn PDF document text
    • http://full814.com/upload/files/pewuwinowupiweluwi.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_off0000b065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 10204 bytes
SHA-256: 9ee168916f68e9967a1aa888dc8c58ee1175d4492d1f349128323609b1af92ac
font_02_sfnt_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 16860 bytes
SHA-256: be5422261d0ca44a4fd2b3f72d8b997a2f2b398a8cb745c843c64ec67a0fa896

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