Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4fda91179bef77…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 01:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e11011a1109e9641fdca3d28c1ab4e36 SHA-1: be154d0fd42ff502f784645117e6067b35f37d8a SHA-256: ee4fda91179bef77dc2a8b598507f8df36b14e2580023dec758668a50cff3245
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a likely attempt to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://kasihpaham.com/contents/files/32929047574.pdf In PDF document text
    • http://bluebiz.kr/userData/board/file/mumonunezuzezukurap.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/96900552039.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/71501241544.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210902170357.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/91849588667.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/gapafopibuxupebisazuzugof.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/40124505245.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/1746689891.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/86695287739.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/xokupozusatokaju.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/volezuva.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/ropusariwime.pdfIn PDF document text
    • http://nature-revive.org/files/file/12443459448.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf9d6bf80---95343327403.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/95633891156.pdfIn PDF document text
    • https://cartolmania.it/file/57875755644.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210913215009.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-11/images/files/75560828099.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/wijin.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/likikimugitewur.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/fujusigirumawulejam.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/zexodusodakurelopuvom.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/dibirubebemidevuramuvok.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49445639366.pdfIn PDF document text
    • https://kede.org/userfiles/file/3997014811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+access+phone+gallery+on+computerPDF 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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 11020 bytes
SHA-256: e2bf5bb3c9bbc37a593e3f044b395bb5c5cee99d6a9eb9291fef68214e7446f2
font_01_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 16840 bytes
SHA-256: 12f3fc13775b19456c04fe8b70cee29bfb2bf62171827f1a5d758b7928706057
font_02_sfnt_off000120a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1