Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ba6e64160a29ae…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 14:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 79ebcd902e2beb8411535af4e8f8b25e SHA-1: 11d6bc622a6556ce1c9ff2511005b5b66a2c7ca0 SHA-256: a9ba6e64160a29ae8b9a2da9f3153cfe86f7c8694687b7275678faa87cf13176
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=undyne+simulator+fight+genocide PDF link annotation
    • https://www.igescanada.com/ckfinder/userfiles/files/wenonovaxar.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210910_809675C930EE7BE8.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/gesopefu.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/81936498885.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/031708a1549027e1c0e410e1b8c8bb47/22678819761.pdfIn PDF document text
    • http://bakoca.hu/files/file/xudapuzobotoziwi.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/17702545350.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109060057221650.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/98857955843.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/jujesimexil.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/18591989992.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/6529064175.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1387dd14---354431627.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/69981432523.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/28229770564.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/30586823089.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/77535091513.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/jabugukukevagakebafubewop.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/95212880640.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/46427545899.pdfIn PDF document text
    • http://cpviettin.com/upload/files/17390428797.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/27220202453.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/24245058368.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/42180056795.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_off0000c73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 20476 bytes
SHA-256: a72c6672a67ee900fc5719590d1ca37b397bc9680269d2854150b76de4b3ae77
font_02_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 11144 bytes
SHA-256: b2a863ce289a01b4cc95a7035ca730b304509b99cb632d0aa83f947e5d4b0d24

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