Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d5aed82c7599d4…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 08:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8c297a00ff1476beaf637b045bf3858 SHA-1: dd0b7def47ffe4afcff71804cee996a917419992 SHA-256: 19d5aed82c7599d4868a70bf61c92e948b21418d4b31c4c486ee9bd35167c5db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The PDF structure and embedded URIs suggest an attempt to redirect users to external malicious sites, likely for phishing or further malware delivery. No scripts were extracted, limiting the analysis of specific execution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=life+cycle+of+drosophila+melanogaster+pdf PDF link annotation
    • http://loveperfectionschool.com/upload/file/boputavavewamavowuxewi.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/dovax.pdfIn PDF document text
    • https://citytrafik.nu/images/file/48252780.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///xatevapexutaz.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/brloioqjei9hp5ndbn0fi8t4o6/zejud.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/24356327112.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/zulirotujevuj.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/dibawimi.pdfIn PDF document text
    • http://zaiger.ru/img/file/78120902537.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/41973984317.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/fawudatadoronifogigurof.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/74373188988.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/ziwijatugu.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/fepumov.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/vomagugegideso.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/bidezaxagixiwiwitoxefubo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140925510e71---pafepubegozin.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/89327436693.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/gogedivelimasorigarogoje.pdfIn PDF document text
    • http://benrassam.com/uploads/files/80738540409.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/jamemuvarowisuviwume.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/34561973659.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/xofoporuzatutopexoluvako.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/wafapulixazowuvexozuwula.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_off0000bb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 15756 bytes
SHA-256: 0f725d06b4eee8ce83d5884859249f54b4f70e543e7e5b98ace7fc3c7653042b
font_02_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 11140 bytes
SHA-256: ba188f9bd0d9588c1e9151d9e6bdc27fea31591eaa167b56ee18816c1220018b