Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbdc3a5507b05ba…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 20:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1f9528affcc902671c50f4c03c5158c SHA-1: c5a2c8f898cd13bf31a74c16423afe9ba2bda8bb SHA-256: 7bbdc3a5507b05baa3116bdd3f546b7c5bcb6cc66ec9916b4456aa5058577a89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including external URIs and a link farm on disposable hosting. The ClamAV detection and ML classifier strongly suggest this is a phishing or trojan PDF. The presence of numerous embedded URLs, some pointing to IP addresses and others to potentially compromised websites, indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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 http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/benixekugo.pdf In PDF document text
    • https://matharu.ae/userfiles/file/63679049107.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/87005385353.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/mlbq2gq4p18norisp0d83nbepa/98223485450.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/wajozogud.pdfIn PDF document text
    • http://rooptex.com/uploads/vobijerube.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/fafezifiwex.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/wulav.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/bibujisofamutepusozoroz.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/duvuxemodor.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/34af0fc29962eac2081411cdb97eab52/21201423771.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/dofopusiwiv.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/bonerosab.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/valamojuzabugoxaxaxo.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/remevuguvija.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/37157986498.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/50584499350.pdfIn PDF document text
    • http://sun-eko.eu/files/file/kizajajoxomimazimijon.pdfIn PDF document text
    • https://efnnma.org/files/file/metakepimuzeponakawaxaj.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/loleta.pdfIn PDF document text
    • http://unseretochter.com/images/file/torezekepox.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161420214b35c8---kovozabigadu.pdfPDF link annotation
    • https://rm-parketi.si/uploads/81289105947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=picsapp+photo+editor+pro+mod+apkPDF 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_off0000e1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 10724 bytes
SHA-256: 4f32d1cb3ed90f6c08f6cc53c13741b6a35ee6fe929a20bece12b19eb71061a1
font_02_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 17232 bytes
SHA-256: 37a09fd6c992c570afe9977a8ebcce8977515d6f6aed3347d4a0c76ab1f90787