Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb95cc68b2554ee0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 03:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c351bdb5449bb4ca889ba42ffd194c86 SHA-1: 923610458d5ffea6dd7040cdc999bc12bd450645 SHA-256: fb95cc68b2554ee0b6c1ab788b889e9d8e793c0e61c4b22f0f806038eacefa8c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a phishing lure, specifically related to payment redirection or bank detail changes. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated, but the presence of numerous links to external PDF files, many hosted on disposable domains, suggests an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320c5c5c208---sozopipiwubotep.pdf In PDF document text
    • https://mamap.in/ci/userfiles/files/31766164160.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/81863296842.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/fofomoder.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210906112653_aj6l86.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/gawubavavobubovitulexetul.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109062114176665.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210906124326_7uw820.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/25127490065.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210906045637.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/zutiwosugetitu.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/gebolewogekur.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210909145549.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/befin.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24240926226.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/33447702641.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/90897943181.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///87052454987.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/kafotupubabus.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/2182418794.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///wenopeb.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/filumavaliwu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137a92c70db4---32287637896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+stock+market+app+in+android+studioPDF 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_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 10900 bytes
SHA-256: 05fd491f36a8265445e71d4494379a081a0f33fc3b4ee22426e6eb36ce5dc1a8
font_02_sfnt_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 17796 bytes
SHA-256: 14f7b4358eefacb87e407d0941f8492805329d3b13ddb0b192c02fbc2806b3b3