Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ecd1ac74ba0735…

MALICIOUS

PDF

78.5 KB Created: 2021-09-14 06:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4de35759968422e072953baf6fff0a22 SHA-1: 656c8e49f2e8714396a51672aa55eaddac6f90e9 SHA-256: 61ecd1ac74ba07355997b21f9bcd61585885ffbce3fca97238ef618cbbd04aba
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to deliver a payload. The 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://nwatchonline.org/userfiles/file/61946394195.pdf In PDF document text
    • http://kamnitikamini.si/upload/files/91084447805.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/lemojabepipawazap.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161377046ca63d---88130711172.pdfIn PDF document text
    • http://fitviewer.de/files/file/87005448668.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a7f11368d21389e88c572dcfa65845eb/vupowiruvafonaba.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/6041808848.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/buvasigokiribokubezo.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/tidirevezunogorogutuwar.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/98766673863.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zadof.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210913100502.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/66898581493.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/16441725232.pdfIn PDF document text
    • https://serka.com/serka/upload/files/40922103003.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/95504349222.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/gozuzaxenapada.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/13560742680.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/lurivejeregifawumilujo.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/60206560978.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/lexokoxetiwemakuf.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/11865608029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=recupero+dati+dopo+formattazione+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_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 10772 bytes
SHA-256: a15c6d537466f6d57de3db97c46625d81d86d990035884c7ba7cb27652d35210
font_01_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 17120 bytes
SHA-256: 6a7d11c58ae0b4e968640d84f18967891576064f71e72d8552dd721eff06a09c
font_02_sfnt_off0001142a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1