Malicious PDF — malware analysis report

Static analysis result for SHA-256 286e43b78af9024b…

MALICIOUS

PDF

71.3 KB Created: 2021-09-09 02:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85b0223b2ee944f215b0d9306ff08920 SHA-1: 4815501871139e317c6d74173261bf8fcc463aa6 SHA-256: 286e43b78af9024b2e4f76e3ff4325e40c6e1939161e51dcf25b8209de886e74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a lure to redirect users to potentially harmful content. The PDF structure and the presence of external URIs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

Heuristics 5

  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=watch+live+tv+on+firestick+india PDF link annotation
    • https://kurtoglumob.com/upload/file/56231782613.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210906_232314.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/58099198055.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/2511637717.pdfIn PDF document text
    • http://art-ball.net/files/file/90268702770.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/64854054856.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/vurivitageb.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/xotidezap.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/88003565750.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613867721f5ef---99138467645.pdfIn PDF document text
    • https://nexapos.com/upload/files/kegesol.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/vuwogikusefomavitewin.pdfIn PDF document text
    • https://pcetravel.com/files/file/5734660299.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210908_E4F55293DCDC820D.pdfIn PDF document text
    • https://sharenkon.com/files/5182495591.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/21080036005.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/84350854583.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161380be599583---mobegikelakiwijavisiza.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/lamotomavunudozipetozaf.pdfIn PDF document text
    • http://ktcz.eu/files/files/solidanaxewov.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/97501489449.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/korazudazumib.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/12363978186.pdfIn PDF document text
    • http://dztechfin.com/upload/file///15799010964.pdfIn PDF document text
    • http://hueide.com/upload/files/36007602000.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/tidebopajiredej.pdfIn PDF document text
    • 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_off0000b5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BD 16080 bytes
SHA-256: 49ebe4345281cdfe59aa2b7951551dac678dcc1facb3216a3659441387c9894e
font_01_sfnt_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 10724 bytes
SHA-256: 1bfe374170b2f5809a64c0424f71effb05eeaf2bc57e694e044479871e522ec3