Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3dddf80df4af7a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-21 09:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 39543e5cc0e1a5679fec91cb71f9fde8 SHA-1: 363bd0d0f8da2311147e77b6025157dcaa2b4b9b SHA-256: 9d3dddf80df4af7a694933f9bbc7734fb32449e862e96c7600040b06f19a8714
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and exhibits high-risk heuristics related to random and disposable URLs. The embedded JavaScript stream, combined with numerous links to external PDF files hosted on potentially disposable domains, indicates a likely attempt to redirect users to malicious content or download further stages of malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=positive+line+graph PDF link annotation
    • http://akvatoria.by/UserFiles/files/vuniwekigekajavigogala.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210913153536.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614684c51c924---77864398473.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/40503518113.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/14232126212.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/24008010317.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/namesegu.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/zajojatu.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/ragokazapusunupixaper.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/91428049363.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/rewotigeda.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/51179981602.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/25896926105.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/xelutinuxeg.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/42633640544.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210921102542.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/konowejus.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bq7d3jjpaket3j9lg4645grnb0/91723634169.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/39198750944.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/36230253251.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/5931707970.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/93970627607.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/xazazefeleduwewa.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/banubexexinuvol.pdfIn PDF document text
    • https://gangnampools.com/contents/files/wifasad.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/10428911130.pdfIn PDF document text
    • 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_off0000bbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 10600 bytes
SHA-256: 3d6834312fdc6abb43a84a32dea4bf9326297f75be1ac9aa777c9c058d0e62bf
font_02_sfnt_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 15984 bytes
SHA-256: eb87199f35dbb7b76b184b77ce704db7d29fcb05c8bdf911505cfc547b0c88a6

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