Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e45b2b492b65c10…

MALICIOUS

PDF

68.0 KB Created: 2021-09-28 07:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8d48c2992767f534e966c29a4849a8d8 SHA-1: 411f8f51c9f31bc98566e25217a3355502b12d9c SHA-256: 3e45b2b492b65c105d74986e2b560052b9b4cd36feb6d7ab053ee512289fda8d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide a clickable action. Heuristics indicate it functions as a link farm on disposable hosting, aiming to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious classification as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 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 https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421770614f0---fusib.pdf In PDF document text
    • http://z-i-f.ru/userfiles/file/76194076804.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/rosugebe.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/zeposoferul.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/jitenilaxovilo.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/79452785621.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/jideramozudupedibaji.pdfIn PDF document text
    • http://meuseguro.top/fotosempresa/files/saboremigoxogopetareda.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/96672579579.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/71761901224.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/80669480343.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/tefamevujuw.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/96065102276.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/71904824148.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/pupibinipixituvov.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/korotodobigox.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/12350603265.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/80321857502.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/negegu.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/serevoforetipot.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/86212064146.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/19729536426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=elements+of+harmonyPDF 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_off0000af14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC726 14364 bytes
SHA-256: 667852cbc916515b06c94119439203dfd61981b77a36ca0e0ce881c55810ac1b
font_02_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 10484 bytes
SHA-256: b7949c21b8a6dcdc9523350ec416cf3b894c7f2ae81fff1d1f9536a6863357b9