Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b67201361f64703…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 06:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ba3bd3fe13a4727549ca295055ca103 SHA-1: f988afb5440cff7d6efead2db6f5844dca8a0891 SHA-256: 1b67201361f64703e7bfcf5d00cdd2d92ba078dea29fdc26801038d25728d6aa
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to download a secondary payload. The presence of a 'download button' heuristic further supports a lure-based attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lexus-custom.com/js/upload/files/vuvisibasez.pdf In PDF document text
    • http://www.siposferenc.hu/html/tomazedex.pdfIn PDF document text
    • http://3asoft.vn/img/files/72895358353.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/84926297066.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144590ab012d---88574884806.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/rutaduzixu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/43874214905.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/mixabugevomefun.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/53747232648.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/68326652919.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/vusuze.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/nusurewamibak.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/30996463958.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/rinifezomesumalaluxuxag.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/vitafabukuvorodaz.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/5118605636137e49934a64.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/mifowemekas.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/25614313705.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/93261175647.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f283856edc---12521901860.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/mefixem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hotel+hideaway+hack+apkPDF 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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 10524 bytes
SHA-256: ee4238fe227cc5452b6e35de91bd27d7bf2704bdf7972f9ef10aee81540d4ce0
font_02_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 17320 bytes
SHA-256: b2cbf1fd2f65576fd874343d26676169578271f956f9e23129c9437ee58e09cf

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