Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c119f04ae93c79a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 19:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb589d912f5c4bb49e41b7dc89cb9a32 SHA-1: 28ba6107bef6683dffd215be2241b7b372bb9ac5 SHA-256: 0c119f04ae93c79afb72109111fe2eb49546f9f54fab1088c82606a7d0cda703
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm on disposable hosting and an MFA lure. The embedded URLs point to suspicious domains, suggesting the document is designed to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest potential for embedded malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://philabc.ru/uplcv?utm_term=ko+player+64+bit+download+latest+version PDF link annotation
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/81867279133.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/gikizurupiweru.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613361f5a468e---fisefufonifipos.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/8730704659.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631515822.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/parifebufemomatapaw.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613647a27675e---79519676913.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/70188228811.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/lenanevofe.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/61292305981.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210910095314032.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/xadomulasemufubizakid.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/8015840275.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/nasuga.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/woxawefobetukokubozix.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/bofaduxulaxiwopevukugoj.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/72058781908.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191200297892.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/18761028317.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/ralemo.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/52868867699.pdfIn PDF document text
    • http://hejia-ele.net/upload/gikobopurinevujadefajifi.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_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 19856 bytes
SHA-256: 2cb16f0d0861c965f1b4ffcc6ac2cb2a6e362be3802e809b9e7eefe8cda68302
font_01_sfnt_off000108ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EA 11028 bytes
SHA-256: 83d6e36a04fd3a35163bc4601a53c30903cac784d425f5aa816d7c913dd17d0e
font_02_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1