Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc776687750dca0…

MALICIOUS

PDF

76.3 KB Created: 2021-10-04 17:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 091b1e56725b0d46b9e2902db07419d1 SHA-1: af6c6d765e8a94f622dce3d021a4b121bea460de SHA-256: fcc776687750dca0bf9a68c3a554c6b2245f9fa4801f539e9511ce1e91f3728f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a likely attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mariapolis.net/ckfinder/userfiles/files/22545057748.pdf In PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/7341705778.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/1783941600.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/70454770055.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/82882523833.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/tutagubaweniviga.pdfIn PDF document text
    • http://membranekeyboard.de/_data/file/bufavikonigegameluvasiz.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/wawax.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210910224443.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/mizanexev.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/72633438910.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/vugasepamugoguwe.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/39371784688.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vadavipajubobupixo.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/donatevixog.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/pamewekisewab.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/rivawuwigoguram.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ce87254b---18857359092.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/niratanememuxamokovomoj.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/67750438296.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/58257529844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=police+constable+general+knowledge+pdfPDF 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_off0000c093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 11116 bytes
SHA-256: 3d1ea7dd58324da1639d9f4f9a3929511a28035e56e5009596bdd6566f2fd787
font_02_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 18596 bytes
SHA-256: 9c43566accfb57ce40c4b61f70fa914a7054dbaac4bd686eec0ca387b783f069

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