Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bfd8d6ac779fc4…

MALICIOUS

PDF

69.5 KB Created: 2021-09-11 22:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 337ba163db04ed55b0bfa60a1a8906ae SHA-1: d53879b33d018dd27d88098ff2c6cfadceefb393 SHA-256: d5bfd8d6ac779fc47a506aaafe4d06cada5bcd4f809f60e20b241f1f3b5591b9
146 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to potentially disposable hosting, suggests a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the overall structure and heuristic firings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://rotarybrescello.it/userfiles/files/93601635360.pdf In PDF document text
    • http://www.bongbansaigon.com/uploads/files/mibasujalupumorazagulebil.pdfIn PDF document text
    • http://etre-belle.su/images/file/75799959451.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210905_BAB2C8DB0B31493E.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/pakokorowo.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/47207321523.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/valetokamowiveli.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/gidafidip.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/zizipefax.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/dekeliwu.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/mulutipebubituduxesotilaj.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132604a8a17c---55878776642.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/46759289309.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/8458011582.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/janatebuwuferutozugasego.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/6458891427.pdfIn PDF document text
    • http://samtekelektrik.com/files/56034136922.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/gunatenugisukigik.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/fixovamepoluw.pdfIn PDF document text
    • https://unaizahic.com/Files/files/40438881917.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/pafabupolixitenekebonoja.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/94005571842.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/8097377381.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/depep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pratiyogita+darpan+free+pdfPDF 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_off0000b381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB98 10572 bytes
SHA-256: 44339d21cbb8989e33c0b3e553674eba89e6dd55bb87a8b763f059a0536a39fc
font_02_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 14776 bytes
SHA-256: 5dd298907a6ca9a871a173d04bcf669c41c3bf0aa4cdc0adcc84281201160386