Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7688cfe3700bc9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 20:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a20b6e59a28360a21e284eda7d06352f SHA-1: 767e068ecd4e9cbadee45ff76a7512fda490569f SHA-256: cd7688cfe3700bc99ee737415dfd1d51bb7ffaf13e9636938312d403f87fd1d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely contacts one of the listed external URLs to download and execute a second-stage payload, consistent with a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c51bd5d1f1---nuvukat.pdf In PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/dovidunifoxuwabevedupazi.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/vifikasedamik.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/47715073037.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/8021511929.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/78898811824.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/bubowomiketuravodu.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/tevodujapevirubixinura.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/44132722875.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109151834248859.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/49112326427.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/vovodifumedije.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/nozagirij.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/87130120139.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/47981174565.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/32550802923.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/jotepisozifafoforofokux.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/63739969848.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/27723151022.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389d372114---23867151825.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/kituwuvotufusem.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/29905738136.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/91217860337.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/sasifadametuzivam.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/wufakedis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=watch+in+the+house+2012PDF 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_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 18532 bytes
SHA-256: 773d389a04e9f1fe25f5e16cab91757d680f595b93eabfd010f11c8eba6bebed
font_01_sfnt_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 10568 bytes
SHA-256: ee347a467ce6f959a699ba537827f036c29ec537860336ef9394c65e8e50e911