Malicious PDF — malware analysis report

Static analysis result for SHA-256 0094e60b7b863d77…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 12:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64452153a630e26ebcddce3a319708e6 SHA-1: 4f3d2c2bfb80e614c88ddd29dbcc3a2b4aa4e9fd SHA-256: 0094e60b7b863d774d1c0cbf4b34583566b6fd863377e087c230d38bf0cd58ab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also features a large number of external links, many pointing to PDF files on various domains, suggesting a link farm or phishing lure designed to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ishvani.com/www/js/ckfinder/userfiles/files/pozupuvapalolosasur.pdf In PDF document text
    • http://toyotacri.com/userfiles/files/45631074495.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/mimijuzowaziti.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/vinababi.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/fatavobutawu.pdfIn PDF document text
    • https://tierlistei.ch/downloads/23348868940.pdfIn PDF document text
    • https://tebra.si/userfiles/file/861651050.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/wibigiguje.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/vudovoriwoxoremimided.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161421e132cfeb---61923914752.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109080237506346.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/67963574505.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/97671243302.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/rutatizidapid.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/wuzikolijapifakolewi.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/wagufonetodijunawikobumat.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/weroxegipunopuwogureban.pdfIn PDF document text
    • http://chikatere.com/Upload/files/nupenulopedo.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090622554173499.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/vepikakasokitom.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/sogojuleposawaf.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/71065197465.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/20277956801.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/71688211974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=shakti+dance+plus+5PDF 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_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 19572 bytes
SHA-256: dce64fdb7baacb24b2a1b54d5e0543a03b9f71b7efa885862db9b0cb05e14eb9
font_02_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 10792 bytes
SHA-256: 0dda962f5393a3036780e5da66eb1e681ecdc3c97ce8ba9db0ebe6cd84b3e768