Malicious PDF — malware analysis report

Static analysis result for SHA-256 10474f0c46ee3b8e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 22:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c155a80aa6601c3cb7b03707f61b51d1 SHA-1: 4dce0026726c220996cd0aeada05f4584870b4d5 SHA-256: 10474f0c46ee3b8ef5b88b1315ae3350042e540c3a042861f0fd6344361988a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also functions as a link farm, directing users to various external URLs, one of which is associated with downloading an APK file. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to the phishing and trojan detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=frozen+synapse+prime+apk PDF link annotation
    • http://yoshitomo-kokubunji.com/jcfiles/file/96003446559.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/20483740117.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/pugagivokevo.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/kokazexix.pdfIn PDF document text
    • http://orthodoxnews.us/file/671840184.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/roxupikita.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/fawodezolejabexopi.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/77386976321.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/powapitoja.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/zaloxokefawuxexisura.pdfIn PDF document text
    • https://bolahijau.com/contents/files/fozixunevoxabomeribize.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/76724529456.pdfIn PDF document text
    • http://stylekd.ru/files/11537195812.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/givugoveni.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445b5dd3256---jetiliganuxijudob.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/70847943425.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/63544620984.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/xinedesenunos.pdfIn PDF document text
    • http://vlajamo.cz/images/file/badopufarefixotix.pdfIn PDF document text
    • https://socardan.com/userfiles/files/wedimaxurajolesobedibav.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/gemiwekevip.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/runadepusewawa.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210916120314_2225dx.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_off0000c887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 10512 bytes
SHA-256: ac54571692958df8dc2d88d4fe1de3ccc04f51de0e8d836dc63dc2d013863c30
font_01_sfnt_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 21236 bytes
SHA-256: adff954ee6324ee4643f89ed45d4db5d7fd864878e97f904f914478a581f6b88

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