Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e50535581653c3e…

MALICIOUS

PDF

72.5 KB Created: 2021-10-01 08:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: da44e5c0fc37fdb7c2712a70c4c36652 SHA-1: 3564d1c29935f1772d02e1637ae69fa172233fc5 SHA-256: 9e50535581653c3ea40733704f6e436108667d2917ddc608ddd2dc49e5610fc0
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of a link farm with numerous disposable hosts and the ML classifier flagging the PDF as malicious strongly suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://kolkatanagariksammelan.org/ckfinder/userfiles/files/ponatinugezetabizubiselub.pdf In PDF document text
    • http://cancercareresearch.com/userfiles/file/25113317313.pdfIn PDF document text
    • http://allasclub.com/campannas/file/povokebep.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614959eb94b4c---latejupunabowudi.pdfIn PDF document text
    • https://hgb.se/filer/file/biribowusunokewagimoteni.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/36282854368.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/wamukuf.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/34852338235.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/13243398788.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/44483334661.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/numunabumisudekiwudi.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/pesogimejem.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/disoda.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/tinuborabosi.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/sorexuxav.pdfIn PDF document text
    • http://nincity.de/inline/file/47931371362.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/putofugu.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/zawuluwuriromukafetema.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/datikirevobawewolan.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/32126194833.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/74754321791.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/padatexuvan.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/797522634.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/38191034613.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/42133680284.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/27646581523.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/rodof.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/70151789563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=applicazione+monte+dei+paschi+per+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_off0000b689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB689 17440 bytes
SHA-256: 088bd2496247a00cc63d3bc80488fb9327da531bf8dc6a2e2f69e3354c94b699
font_01_sfnt_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 10820 bytes
SHA-256: 1d35b4c1e92a898e8b8d583da6d6ef351981ef83e79787b5b908bab140813d59
font_02_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1