Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1cea13f2dbd189…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 10:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d900ba4e29cd3ca8b249f033eb00a60a SHA-1: 74e787ed7889d02d2038c5281824f6414a9776c0 SHA-256: be1cea13f2dbd189437c835d8591fa1cd0d9f80264dbf851ef4c2f1ba82b4c23
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to various unknown URLs, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the PDF and the presence of numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://bsa-billiard.by/images_from_html_editor/file/96443269099.pdf In PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/43039745536.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/wibusutepov.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/goxidi.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/kezimajijot.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/35972270843.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/fafapalapewejanixoro.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5a22b8d3---faxalalufilibeme.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/kivixodobave.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210913035346.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/77007987670.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/wapenuradenabesogenozopu.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/jetokepidikubogafeme.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/30191214678.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-10/20210910155724257108.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613847ccf1e57---22027105730.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/15030917778.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/2947002570.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/sodevuxif.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/jorekabavilaz.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/mivuzosogomeniv.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/duzekegulop.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/putufezuteriribogo.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/42749196733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+change+default+pdf+appPDF 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_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 17732 bytes
SHA-256: 89175a4341892c4ffcddb8005edba0c2e9469c71c615fb405e59a06ede5e6f48
font_01_sfnt_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 10812 bytes
SHA-256: f63c805697a6fe26fb9e2b24da1f2d8d56da8c7220b8e480becc19151753c749
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1