Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f40c12263b14e2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 04:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1816fc3feb86f4cb179cbaf336eb5d9f SHA-1: dc0e44e3f97b597b28587a3682f67059e154f03d SHA-256: 52f40c12263b14e241b10352ac66fc6a316f3d89fd38cc426f4ab3b8d308cdd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://smidgel.ru/uplcv?utm_term=vsco+free+video+editor+apk PDF link annotation
    • http://email-database.info/userfiles/file/zizojiriligirexanodugela.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/23459638549.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/44985191272.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/c9jn0hnnnbep1npskqkh79mge0/49170869422.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28052728554.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/dixizojuxubuzixijamorige.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/10994671403.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/mugololubafatijanila.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/liwumawifigivugojufokuk.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lafud.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8e51c78427fff02f3173bb6b51c48a0c/kitadupot.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/60386694897.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/madak.pdfIn PDF document text
    • http://kgmda.com/upload/files/87811727158.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/zuxituvu.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/fasudomegugumukafageg.pdfIn PDF document text
    • https://tempegaring.com/contents/files/tinusenolozopile.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/zopudokuzoroxu.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/40876819916.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/basaxeruviwasunalovi.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/39416168004.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/rebetatepoxozezajafekeli.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/sesiwezujesapuguwefuve.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/55693272429.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_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 17420 bytes
SHA-256: a4f3526e3a4a08939843197f3b736a6be6a2d34a6c0ab7a019cfaa7d61bca736
font_01_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 10592 bytes
SHA-256: 21d05057c70aa14dfe4b6e3d40af9851c2139802023970e575cdf8b4f9142fbc
font_02_sfnt_off00011eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1