Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b5b360e31b82a2…

MALICIOUS

PDF

67.6 KB Created: 2021-10-02 11:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7da767e934ffdbe88c2457e669ae2718 SHA-1: 0eea7ef78bba3bb0f9e71723617add098f6bfa39 SHA-256: 13b5b360e31b82a2397961f7f38fd93154e5a48c1c8ed5090e984295fe7e537a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, a common tactic for phishing campaigns. It contains numerous embedded URLs, suggesting it's designed to redirect users to malicious sites or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 67 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 http://kbchina.de/upload/safov.pdf In PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/14518110409.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/81893752565.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/gazaneve.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202110010432228923.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/vevevaside.pdfIn PDF document text
    • https://projetovm.com/uploads/files/51209083227.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/nejuzinogajusojami.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/8084069553.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5645903374.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40567702939.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/7075483938.pdfIn PDF document text
    • http://rafaelokazakov.com/file/88742038021.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/vutuxolapiziredemozef.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/11431088450.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/58c989fadf504e968537ed741b85cd4c/latozowadutejataxuteti.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/26823503607.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/6231804028.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/39663052963.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/lofagomabawagiw.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161534f74c4424---92136992717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=90s+country+songsPDF 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_off0000aec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC8 10380 bytes
SHA-256: ff56fefaa4e2e4a8f7c129e7969f1ded1a1da297a7ddb7be271da993cc44f4a7
font_01_sfnt_off0000c66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66E 13964 bytes
SHA-256: 7763e89dd381d25bfeeb792f9add1ac8fef486537d898e98c40ef070d953cd0c
font_02_sfnt_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1