Malicious PDF — malware analysis report

Static analysis result for SHA-256 022bf3cbf31f0b33…

MALICIOUS

PDF

87.0 KB Created: 2021-09-11 23:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8124ec8cd2ff4ab626e0f1644cfaad7f SHA-1: d13dd3e2958cea1e496afc9d019604debdd6f1ab SHA-256: 022bf3cbf31f0b33b2f4e2f8959db74f7f9cf772a7aaaba6df790612caff5fc1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains a link farm pointing to multiple PDF files hosted on disposable domains, suggesting an attempt to distribute further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic to bypass gateway scanning by instructing users to decrypt an archive, though no explicit password instructions were found in the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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
  • 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.
  • 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://kramnyca.info/img/upload/editor/file/domofezaso.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e0ef4c374f46167f03d33360e49fbd45/favokapuru.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090619504844.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/25066763995.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/90526213525.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/tokutotabakiz.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ad6ad6e1---40188426734.pdfIn PDF document text
    • https://novitas.ro/files/lorodano.pdfIn PDF document text
    • http://pk.mo/userfiles/file/vataweretelodov.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/xeweviripimigowawupodu.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/27848007533.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/43375188432.pdfIn PDF document text
    • http://slovoveri.org/userfiles/babowebasebamiselupibolo.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/rufulufudatuwap.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/difupewisuroruwevalofikug.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/tugekulugekuvifukejel.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/refupilosepelalalaguzo.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/movutematopo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/zevenexobitareketif.pdfIn PDF document text
    • https://atavio.ru/files/file/12715677284.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/80533958193.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/goxabawiwexunugo.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/zumudupotod.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/zulirexariniwofexut.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/24767665326.pdfIn PDF document text
    • http://kco.su/userfiles/file/60812065507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=para+que+sirve+una+vpn+en+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_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 19020 bytes
SHA-256: 01e1d806a17509a2eae92552c846f7365a52d8664a81132f73280374b7d371ba
font_01_sfnt_off00011daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C1 10552 bytes
SHA-256: 4d36892c64a4265f68e45141e5ca606ed563ca968d82bbc4bd15eac02e2b00ac