Malicious PDF — malware analysis report

Static analysis result for SHA-256 7adb4209684aaeb8…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 22:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3dd3681ca96156b8046eaa869127fec SHA-1: 5fdf027685c28e49822d8e29e8d50fa6d79744ef SHA-256: 7adb4209684aaeb80848b6e42fb05a7a6617a6a981fdb16673b3f7a2a1978df4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier. It employs a common phishing lure by presenting itself as an image, encouraging users to click a link. The embedded JavaScript and numerous external URIs suggest an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=sweet+dance+mod+apk+unlimited+gems PDF link annotation
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/kusuzigizerusujuramer.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/96321420081.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/bilulabiginuw.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091219014473499.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/radopebebule.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d46160c17c---modabuk.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/61047752203.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/56553038730.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/17859379826.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/moganafo.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/fiwemidafibomofij.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/32658932134.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/zakopijexopagigivi.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/zemuzizanogegogos.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210921_8B95182F4227E47B.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/26495111213.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/6293948914.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/momisilas.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/garuzizimudisida.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/45469266607.pdfIn PDF document text
    • http://moretonassets.net/userfiles/dukusuxasi.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/44470309313.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_off0000af23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 14352 bytes
SHA-256: 0b403795c28dd7196ba889248a7ab03eb7db3c3aabeeb0d2ea3c742e9602c0c2
font_02_sfnt_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 11108 bytes
SHA-256: 4c4a4623b44b3e82f331f5c1a685cee3f317434e3612fdf9843444beb5f410c0