Malicious PDF — malware analysis report

Static analysis result for SHA-256 556ed18caa7004a4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-13 10:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d41473f2300f659c1304713612f50997 SHA-1: ae7eb59e331f1e076e38af239413d34dd9418532 SHA-256: 556ed18caa7004a4fb3c3f69be1762324ab5e4d59b1f541168b077f79e06fd0b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external PDF files hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://thesnowmanicecream.com/ckfinder/userfiles/files/sorisawudipagijuji.pdf In PDF document text
    • http://yourmoneyyourbank.com/uploads/File/50287754515.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/82342062013.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/tupim.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/48748922003.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/43309000370.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/suvapuzoribepidotuzusa.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/9945439760.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/7820397035.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/95097181985.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/vomeribez.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/41761670556.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/7917055269.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/vumegiwosonikopibedowa.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/50316446023.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/98320155384.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/tenule.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/58016701303.pdfIn PDF document text
    • https://kermanrooz.com/img/files/61015142995.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/64543114722.pdfIn PDF document text
    • http://infosierra.es/images/editor/vukuwitirexime.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210902032505.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/17942865182.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090305245773499.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/98451983749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+fire+50000+diamond+mod+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_off0000b2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FD 15000 bytes
SHA-256: 3723376ca69d879f72260c8b8e1c89b914bf807d435d7f7414b0cf46ca4d8206
font_01_sfnt_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 10672 bytes
SHA-256: 2afb1706c833de8232c4b213f76568089c682427a308a8649e4c98b2b6ec4490