Malicious PDF — malware analysis report

Static analysis result for SHA-256 039b6d123158501c…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 00:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1e51902321357decb8ca195b2e53f447 SHA-1: e79b64f9e9e007f4e82b952bee09aa3aa21d649b SHA-256: 039b6d123158501c553a0d97f7dcb3482eddb54da9fc3dde9d77838c1c0679d0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a clickable action and hosted on disposable domains. The presence of numerous external URIs, particularly one pointing to 'coretry.ru', suggests an attempt to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing the phishing and potential malware distribution intent.

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
  • 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 69 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 https://coretry.ru/uplcv?utm_term=apk+ipa+spider+man+ps4+download PDF link annotation
    • https://photojet.bg/userfiles/file/34051252825.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/45689498930.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/pedoxetanedabogesu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161405044b4836---wirowuzego.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/31884189825.pdfIn PDF document text
    • https://zagi.hr/files/56053610648.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/67155760966.pdfIn PDF document text
    • http://info56.ru/userfiles/file/36409305564.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/11870093389.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1498308222615625695ebb4.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/xezemilusaxufenadotem.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/21764796601.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/51266662341.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/69591258087.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210905005558.pdfIn PDF document text
    • https://dernek.daynexdemo.tk/upload/ckfinder/files/mijifokovadefokegexiwimof.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/boxezavapu.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/zaxipogu.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/nedamimexetabamivefiz.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/rafofumi.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/34165635166.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614fac90a9761---bagesavozugusenageg.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/29442229447.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/misawavuloturavokovoti.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_off0000b253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB253 10692 bytes
SHA-256: cdad4548c9ea66ce6b7809a4b63eaf9000f266fe634a9c9f9377a55b70ca812d
font_01_sfnt_off0000cae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE7 13744 bytes
SHA-256: 215b8bf59fe922422e76fe4e7e279d4d35a0db340351aae1a90b30a066daa207
font_02_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1