Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86d6560bbda87fc…

MALICIOUS

PDF

75.2 KB Created: 2021-09-21 17:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfeaef3ddad09ee5abf164a9333dc537 SHA-1: a6a97e43a250968e59ede1e353db06e88ef9878e SHA-256: e86d6560bbda87fc8f3471949e79822a164e9630c46b6b768236d6c0f0124856
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to distribute phishing content or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=how+to+delete+history+on+samsung+galaxy+tablet PDF link annotation
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148eb164f0ef---nobukopetubilunen.pdfIn PDF document text
    • http://napiarsaigh.com/images/88641868728.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///nemen.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/98596038267.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/28617937599.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/77176471964.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/penegepoberupexeti.pdfIn PDF document text
    • https://soechi.com/userfiles/file/nobisasepudifazofebitax.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jufinolofadotetixibovafol.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/welezefafefore.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614194a6c220a---8240077553.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/199161622.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/zigodaroxuruvejizogerotol.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/lemanasetovotidirupukaxum.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/30027670064.pdfIn PDF document text
    • http://selidbe-beograd.info/files/nidozifetupe.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/varorukawolarejo.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/6823109191.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/butol.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/tomiwezakuxetirokujuni.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/76555970279.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/53771363071.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/70081928983.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_off0000c1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 11228 bytes
SHA-256: 7098f16cd6b254557172d628479650e3308d9cff91938f71d065cc152342b1ca
font_02_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 16664 bytes
SHA-256: c24731a0272a2f4a941c2c0b3cbfcf75da96cba904131ff090b449ded62146ec