Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6a3914644f2cb0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 06:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5ddd8254677734c2851726fdd8414c66 SHA-1: 2ca4364a3a8bf9ec10c3f4ff7955905fde9bb943 SHA-256: 5d6a3914644f2cb0812989eb04d2f0cea1270c42265198d1abff1773ccbe0130
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many of which are unknown or point to potentially disposable domains, suggests a phishing or credential harvesting attempt, or the delivery of a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea2ac459b7---mowirolipevap.pdf In PDF document text
    • http://ndt-tl.ru/upload/file/biwojevuwotiwudesofaremo.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/pufozizizu.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/91988124681.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/13652099474.pdfIn PDF document text
    • http://kaies.net/upfiles/file/28720098307.pdfIn PDF document text
    • https://blugarden.eu/file/14192623522.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/94212730420.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/wulalojubokufujovumizuvet.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/zigokazokebaladarefuvaxit.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/46922806232.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/87844439230.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/wojudududozix.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613066a37d9db---94125976739.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/8281417533.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/fatubudufu.pdfIn PDF document text
    • https://bselink.com/userfiles/file/tedumazawugusuvifes.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/86693994878.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/wetogawaka.pdfIn PDF document text
    • http://charivne.info/images/file/vufopasifezi.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/pajatakefunusulopisas.pdfIn PDF document text
    • http://canvangdientu.com/images/file/nitikemomix.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/85099656691.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/67230937267.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/8830393027.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/nuwun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=voip+application+for+androidPDF 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_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 10284 bytes
SHA-256: 7db0b08313a0381ad339df77727936ab2bc1a39fba055f0e551bb28f44acf217
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 16944 bytes
SHA-256: 82938e6ff1e653f9a4e816fbad550ee692e06abb9b21a050ac303886ae0e20a6