Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfaa62c17c7198d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-21 04:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86a06bc7848c296d8d721bb07253cd40 SHA-1: 246b2efb9be4fb4888a63ea8bc41fbe67c230d19 SHA-256: 9dfaa62c17c7198d30cee5be43f8f5ef4cf89524b6cade473873ed2832c10cda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=anime+wallpaper+hd+apk PDF link annotation
    • http://candientu24h.vn/webroot/img/files/71687627395.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/wexuvaj.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/bitubegelogudojapadox.pdfIn PDF document text
    • http://hidramaco.com/files/files/verazirisupupa.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/33297538723.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/79871735952.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/deladubetixijotetagizojog.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/lasatofutalufeduwug.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/ripeputi.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/91700091040.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/worif.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/55234727628.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/velepujonalodegekepexenek.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-19/20210919015041646142.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/53532933339.pdfIn PDF document text
    • http://skupka23.ru/upload/m/98948173033.pdfIn PDF document text
    • http://chinalabware.es/d/files/15529586766.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/55473078530.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/23736364935.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/keroregij.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/89116749998.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/38993327204.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/davitotebugiwenogaketa.pdfIn PDF document text
    • http://autovoda.ru/upload/files/98181861927.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_off0000cc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 10428 bytes
SHA-256: 3c4cdda0ab1d9150df4cce0ca2675e7b8b10d9f8c3b3a877316509053146734f
font_02_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 20300 bytes
SHA-256: 63341ab60177f634aab047fffa89b2a3fd5b3ea430e50dc3c2d3f11fc888edf7

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