Malicious PDF — malware analysis report

Static analysis result for SHA-256 24227eafe3e55615…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 18:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: effd8d0c2cd64267f45914930a2c61ea SHA-1: 19c4ae676f218233979ea972f3631df4f902ec7d SHA-256: 24227eafe3e55615e501f99b74a4c92851cbe3487b5c0614c1bcc1b1dac5bc59
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and a single clickable action, typical of screenshot lures. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://usaoxin.com/userfiles/2021-9/file/97960534962.pdf In PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/rebamobevapu.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/texoful.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/72292741671.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202108312221594045.pdfIn PDF document text
    • https://mcorretajes.cl/upload/file/lanabaj.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9a5e20b5---27127292716.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/70436652735.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/26184815810.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/kusojasago.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/todomojewodawolefodutuvu.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/duwutusek.pdfIn PDF document text
    • http://bluebossa.pl/files/file/xafagupakikopi.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/bagapikijigejubizituwevuf.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/36599890612.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/zumemekebagowi.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/mevotukip.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d158498---57213852622.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/fadisov.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/narotaler.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/lumodaxonugodarerasowin.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/59779985080.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/wunimujabebopani.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109151649284439.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/fuxoxoduzedud.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1632091989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+my+fashionPDF 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_off0000affe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFE 10308 bytes
SHA-256: 1b92df83bc4b8c81ce08af0c77f0170fb8fd24caf527ac2a8a2d026e4c4219bf
font_01_sfnt_off0000c712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 14276 bytes
SHA-256: a1258efb1da6b3030c3a0fcae7aa953ff3d342b821224f9c414f0bb813ab443d
font_02_sfnt_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1