Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f98195595d80fc…

MALICIOUS

PDF

84.7 KB Created: 2021-09-22 10:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b8a549ed9935e0197576984558d992c SHA-1: ec6df73e4e6cc1ef576ae99a793f5efefcd5c973 SHA-256: 73f98195595d80fc53ac8043016e54997bebefdf4ea29b437d5610504f6543c0
146 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains a large number of embedded URIs, many of which point to suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wastran.ru/uplcv?utm_term=idm+plus+android PDF link annotation
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/gavovavi.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/puvawoxidakazulegenuwa.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/88374589075.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/99039120007.pdfIn PDF document text
    • http://synergyproperty.com/images/files/60282148848.pdfIn PDF document text
    • http://japhina.com/upload/file/79447790673.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/lanetilered.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/46174787704.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/zapogusukas.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/gekenaxek.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/66329650116.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/15698902799.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/37603266597.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/zufevetalopoxopawawuxe.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/gudanuguxeri.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec708c5639---belig.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/fulovipa.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/vavajoboxutuxugiz.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa4629284---4635845092.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/31458038528.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/mexabawug.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/xegoxifijogakalomex.pdfIn PDF document text
    • 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_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 17296 bytes
SHA-256: 725cddd68baf7dc9f560d1e9b950fd93074847b4b751e11697556c16c60b83cf
font_01_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 10376 bytes
SHA-256: 68f0b88cdfdab93831c0254c274c65b78616c686c6c1217c4254f31df8792101
font_02_sfnt_off00012d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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