Malicious PDF — malware analysis report

Static analysis result for SHA-256 0402150b4e50e817…

MALICIOUS

PDF

81.6 KB Created: 2021-10-06 17:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 006193e5494a68dc2f0d9dc71112d7d2 SHA-1: 27caf11a120db2bbff575c3ba80498e49b517cb3 SHA-256: 0402150b4e50e8178aa6b762c0d9100b4bd8789437f5a71cab04632f73d36cde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document body is heavily obfuscated, but the presence of numerous embedded URLs pointing to various domains suggests an attempt to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically points to this behavior, likely as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ttccid.com/userfiles/files/60257379405.pdf In PDF document text
    • http://tiendanatacion.com/noticias/files/rukivajodugev.pdfIn PDF document text
    • http://schubert-hh.de/image/file/50173016692.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/82158052585.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/pariruwelabegevadutif.pdfIn PDF document text
    • http://kalbaninc.com/userfiles/file/3809546632.pdfIn PDF document text
    • http://maihome.hu/admin1/file/46125349392.pdfIn PDF document text
    • http://www.moyekolodin.com/files/77903829626.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/15567940718.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/19433607735.pdfIn PDF document text
    • http://seritour.com/rsm/files/koronatu.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/72586776356.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/17071048405.pdfIn PDF document text
    • http://delve-cr.com/uploads/demotet.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/ditowapaxivava.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/vebukowifofi.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/32787311190.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0233ece6def8717800f5c3eb9affc20a/putadidez.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/57666083216.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/gabisupitojes.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/68219399501.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/migosanumuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=leprosy+disease+definitionPDF 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_off0000d780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10516 bytes
SHA-256: eacc3177daa2e9760af9cb18f53e5c950a5b9a86559de82caca5558f44b379c5
font_02_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 18712 bytes
SHA-256: 3cca417690f4f3469396c4cc6fc1e38f67207e0e05326e3cbdecbedf1da95e09

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