Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9c9b6d988a5cb9…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 13:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5627ac0d53b50ea8952e6a125d0507e2 SHA-1: 2016e35dfe23f6ba9323145c717f80bb1b3424d8 SHA-256: 2f9c9b6d988a5cb93669eef8e35129a4f288b9ee294420e7e0c3ca7eba733f1f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs, which are often used for phishing or to download further malicious payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://windscrm.net/files/file/wadurusetaduxodezasekan.pdf In PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/34118448124.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/31746703121.pdfIn PDF document text
    • http://888chji.com/userfiles/files/95045750542.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/98554063544.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/lupenisofebesup.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/88019190721.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/fimerabodogakeli.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/padujurutebaniderelama.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-10-10-23-05-87.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/finekiforudowobazu.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/wufazese.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/95232728451.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/najunobeb.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/5454664155.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kaxemujefajetepubinovus.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/86107408736.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141e23717906---paxifojeja.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210916015446.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/xesenafoniluzivuxuwul.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7375dd5274258b494edf79246cdf9efa/59959015986.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/pesidewakadebadelu.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090413094973499.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/49726385071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pubg+lite+for+ios+in+indiaPDF 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_off0000df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 10768 bytes
SHA-256: 07764673f6cead2cf179f101770d9b035d30dd3c65ed06af835c498eaf4b6a9f
font_02_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 18560 bytes
SHA-256: 12cf9e89d9d1e5189108db0e43e202b28923b8d449199fdb6bd507c83424788a