Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd1c4781e1e0f61…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 19:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c097ee1c0e9b043d335402e0a3bc365a SHA-1: 22d5cf619e456fd444a5dae00ae528f43a3de70c SHA-256: 8dd1c4781e1e0f61301887b297725391cacb2d1f89e769393e6498062f18c4fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially malicious hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded JavaScript.

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://inwebjor.ru/uplcv?utm_term=ludo+comfun+mod+apk+unlimited+money PDF link annotation
    • https://moulindelarroque.com/userfiles/file/sibaduva.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/zenedoleludixopaf.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/nulazoxaxegekejevozelulof.pdfIn PDF document text
    • http://sjhtractor.com/d/files/50867195056.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/xuwotavarujumolu.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/86892136982.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/seruwiduxunoz.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202198555109757.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/ramuvutozafibepemed.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/49789719202.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/02ef1785ee428719b4309ad6673f1e24/datamekelubukoji.pdfIn PDF document text
    • http://hk-keber.de/images/file/wosaxasupofabu.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/wobipo.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/desugadefinanawiwu.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/sulifanerepet.pdfIn PDF document text
    • https://inarsindbari.org/uploads/41861127425.pdfIn PDF document text
    • http://test-immo.com/file/83970515912.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109121537175357.pdfIn PDF document text
    • https://ijp2.com/contents/files/wozunalusenalavotewabe.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/bebubeke.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6360385372.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/xokuxozamoxafexekabe.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/87454931770.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_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 19972 bytes
SHA-256: 9049d9be6a374edd20922ca571aeef0b66aec29bf98aa58746116dbeb506dd7d
font_02_sfnt_off00012aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 10776 bytes
SHA-256: f71af73efe5f01ca86750d996e21ed7774f49c6f8e785a19d1c7ae89ca0970d9

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