Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e39db7f914ad6b…

MALICIOUS

PDF

81.6 KB Created: 2021-10-08 21:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0f6dceb6483b56fe6d2415b4281a38ee SHA-1: 96ffb2b13af4e23f6129b8cb34fc65a829e3f031 SHA-256: a8e39db7f914ad6b5ff8303ca7f6e2c14b0dc1d521ea8f29c9c59ef7e508e522
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that masquerades as a cheat engine download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=assassin%27s+creed+valhalla+helix+cheat+engine PDF link annotation
    • http://vektor-bezpeki.com/userfiles/files/31933500848.pdfIn PDF document text
    • http://devison-matras.com/upload/file/7536253732.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/ruworujuxaz.pdfIn PDF document text
    • https://aneri12.eu/res/file/88716945994.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/diwusaro.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130067fe73e3---14448884.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/95877265899.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/vurusisozuw.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/4581814148.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/19172591360.pdfIn PDF document text
    • http://fedime.org/imagenes/fogodoxirudijederifixanep.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/55754240694.pdfIn PDF document text
    • http://modern-pro.ru/files/file/pelevadudokovizi.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/36959373976.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/wewisifimajixekosenukomos.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210929105210.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/gipiboloxeseberupukib.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/28599865690.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/14671759200.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615087af03b93---99586492026.pdfIn PDF document text
    • https://swiz.eu/files/editor/25612082097.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/pibugi.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/99045215460.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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 18792 bytes
SHA-256: b5fe67130fbae5827df445ecb79fc9459f6b98009c7f86a2102af96e69db76fe
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 10712 bytes
SHA-256: 3e99fc0e55dc03d52659332ca252360882b8679d5dfd9f5c916daf5b15742819
font_02_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1