Malicious PDF — malware analysis report

Static analysis result for SHA-256 579c6123dd4e9bb3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-10 20:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c173987d3b3d32899707ebb66fadfada SHA-1: abf5dc9ef0b991a18bedb465d9ea52527ac47687 SHA-256: 579c6123dd4e9bb3670372445fa646753d0a574f5deee0b03faf8a72b431e71e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating phishing and trojan characteristics. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161326f0621d89---95457493799.pdf In PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/95745600161.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/56511504807.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xexumofipomawu.pdfIn PDF document text
    • https://mimpishio.com/contents/files/36219026102.pdfIn PDF document text
    • http://mopron.ru/upload/files/33630428447.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/63679431297.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/69139526025.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210910192156.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/77148221405.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/goferunogej.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/fetesij.pdfIn PDF document text
    • http://yanartextil.com/firma/files/91495023824.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/jajapokomagegosadawit.pdfIn PDF document text
    • http://osayit.com/images/file/13091779198.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210901185929.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/23926851855.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/birum.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/faloz.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/49098450162.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/wemarafipanijaba.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/mekopojurid.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210904065516.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/74827719338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cruella+movie+123moviesPDF 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_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 10608 bytes
SHA-256: 6cc2172fbe013b484306fdf0289db026fc77daee9db28093c170bc87a3c0981b
font_01_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 20264 bytes
SHA-256: 3c7cb4134373a43fe4140a238471907a1c65e3bb49b6922045d92b1fea786795
font_02_sfnt_off00012a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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