Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e80787a9049bcb…

MALICIOUS

PDF

76.1 KB Created: 2021-10-11 16:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4dba422f9a9a11c0f5d0a7c1915f3428 SHA-1: 4fe1f155f687f9ddd1e81580b08cd2a8f25c3e3d SHA-256: 05e80787a9049bcb40f02187e0e4d2e64d04bca164d18d0d1efd50bc39c92175
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://colantuono.it/userfiles/files/wemutulazinulum.pdf In PDF document text
    • http://tuttotop.com/userfiles/files/2947779487.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/gisemi.pdfIn PDF document text
    • http://aminotp.com/upload/files/lajenura.pdfIn PDF document text
    • http://clickvay.com/upload/files/45532545824.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/ropapumojelide.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/10224147002.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109152055205135.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/98931201531.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/21183893144.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/pezizebarojekulapodu.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/lidovukedavotivokigipa.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/519360172.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/fopafigasalusaniloje.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/18188876545.pdfIn PDF document text
    • http://surtek.biz/image/files/20150324_225725.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/40765589475.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/84632466273.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/tatefabomewetoxunekuza.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/77271069772.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccc715f6a---85576026469.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/sebowakukek.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/92792406089.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/nunebusedidibise.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=bad+credit+payday+loans+guaranteed+approval+direct+lendersPDF 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_off0000c25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25E 17896 bytes
SHA-256: 8f5ad8b867b686d0759213a860fde245c805f75b7f3cbc1e253dc6eb9e9eeafd
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 11020 bytes
SHA-256: 0a47f5e0dcf33b1cc7c393d28f55996bd31937caf307a61ae5fb9b556f7aed73

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