Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae1a49606fb6124…

MALICIOUS

PDF

75.9 KB Created: 2021-09-25 10:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f1db646344ecc2027dd30dffcef30da6 SHA-1: 2e3fd5aacc1ef96891481512a3d124b34a48195f SHA-256: 9ae1a49606fb612454cd7929addbfc1de934f78cae92e5c1934369d2765d480b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or SEO poisoning campaign. The document body is unreadable, but the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the intent is to redirect users to a collection of other PDF files hosted on potentially disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bfcy88.com/uploads/files/pidodinifumesudutexija.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a46cdf5b0---28436119001.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/rowevi.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109151822537466.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/42651859498.pdfIn PDF document text
    • http://vit-physio.de/file/94968630997.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68903371792.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/mifolakurebumujevifuxe.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210916092001.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/34694827281.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/kekujinakupok.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/36186446545.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/91g4r72drteac4u0oviq62j2gm/nepexaxefefatunalos.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/11631745433.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/24351497530.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/rudeketonerunep.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/betuxi.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/44119346922.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/35577539931.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/80630178162.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/48573474980.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/jabivevawosewuwekewom.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/46548737517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=unsupported+file+type+androidPDF 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_off0000bdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBA 19692 bytes
SHA-256: e59334569a8872844304ebafab6d56852bdaafbc7b327fa630ff67c2c5e3a8e1
font_01_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10712 bytes
SHA-256: 4c688a25768843671316ee2f491e27c804cc5f5c7029f75ac5bdedb1494c5f6f
font_02_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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