Malicious PDF — malware analysis report

Static analysis result for SHA-256 c751640f95b5faf9…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 12:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bf0120787609e1c13eff7ee25b4f7927 SHA-1: 2964af6e320c2e89df2f75e877c2a655e3b0087c SHA-256: c751640f95b5faf933242801d6ef6a810debb4384430b868422f9826d62660d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to direct users to malicious sites. The document body is unreadable, but the presence of many links and the high risk score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://savitaco.com/uploads/images/files/tasijomitojumubi.pdf In PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/63224176384.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/67122062497.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109020227543723.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fd3bf6523e497a9d07c63daa48a3ca1c/99858010346.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/8124552819.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/95993974139.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/gizopina.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/62364493763.pdfIn PDF document text
    • https://tessuno.com/upload/files/6134add559ee5.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/59223673157.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/34854574816.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/kedivugurizok.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/gaxevexigug.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eda76607e---sevemozovi.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/bulopasokatevejuxav.pdfIn PDF document text
    • https://kham.vn/userfiles/file/benusufefapaliw.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/74797861383.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/89978276153.pdfIn PDF document text
    • http://stroi-sistema.ru/img/69233377892.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/junekevexibogedik.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/17633428688.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/40588838669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=night+of+the+undead+korean+movie+eng+sub+watch+onlinePDF link annotation
    • 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_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 18752 bytes
SHA-256: 50626d0e480a8744e2ca5048799c53241738c82ab579b25692d3ac70b559d69b
font_01_sfnt_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 11384 bytes
SHA-256: 54091998e90c2f5cca587eabbc883397e77554257f1b374f6da4cf59806bb548
font_02_sfnt_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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