Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee9efcbc9651b84…

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 01:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc401af2a85af7b27f752f6540b3c0b0 SHA-1: 31931357f368070f84363165e7dda4ef87b04a2f SHA-256: 6ee9efcbc9651b84b70ec3d716899c89da2f48a2e8f1406ed2cda7dbab8502a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on potentially disposable domains, indicating a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://gancza-yacht.pl/userfiles/file/xoxigomapetoligon.pdf In PDF document text
    • http://tagsu.com/attachments/fckattachments/file/57295049767.pdfIn PDF document text
    • http://whatdwellswithin.com/file/45085175197.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/85665313440.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/46501877372.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/xaparapes.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210916010213.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/tawisiselaxepe.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141669ac8183---16953997614.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/suzubitotove.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/65915556146.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a325e091a---60113226673.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/16322450455.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/41736516870.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/40989358732.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/ralokubekajavetes.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/tubokexekebumogeze.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/71473372294.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/82322754834.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/23266706396.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/wetonisitu.pdfIn PDF document text
    • http://alkanboya.com/files/file///48167604358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+tv+izlemekPDF 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_off0000bf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 10276 bytes
SHA-256: 57e5957526e0c3aeebaee1e4cfc65fc8226b3f4b248f39beafc95bc77e60dcd8
font_02_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 17152 bytes
SHA-256: 68d7e0a2216601060db030662e25d4c46561e4ac5e82ffef7b1a8a936d1743c3

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