Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f659dce796da119…

MALICIOUS

PDF

85.7 KB Created: 2021-03-24 00:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8ea96ca6cec3cb280e26ff6111c6cadc SHA-1: 30a559e7cccd1a6fd353008e16865be24e029e06 SHA-256: 6f659dce796da1192e8e39e837f1f01bc2de58467c14f04ce141fe52b65ec3bb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/award?keyword=coreldraw+x8+shortcut+keys+pdf+download PDF link annotation
    • http://devgm.design/sisamadusobv4h.pdfIn PDF document text
    • http://nemesun.iblogger.org/17477535783.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/giviri-zelesa-bujubedetotir-wivexaxu.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/calendario_liga_portuguesa_2020.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/can_you_refill_nespresso_pods.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/povepejubumezugibof.pdfIn PDF document text
    • https://dawopodesolapip.weebly.com/uploads/1/3/5/3/135327749/gomozejakin-bufux-rakawoweroki.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/bacterial_cell_wall_structure.pdfIn PDF document text
    • http://zuviwadakaji.22web.org/mebevese.pdfIn PDF document text
    • http://fawopomowuri.iblogger.org/que_es_la_bichectomia.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/takom.pdfIn PDF document text
    • http://barberking.best/dibujos_de_caras_expresando_emocionespd28b.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/2656640.pdfIn PDF document text
    • http://fuxanujibiz.mygamesonline.org/islamic_books_in_urdu_free_download_barelvi.pdfIn PDF document text
    • http://podcard2020.site/esquema_enseanzas_lomcel6c65.pdfIn PDF document text
    • http://burrrhey.tech/kawupotetugamobaxapezu363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wixudilasajigil.rf.gd/ashrae_fundamentals_handbook_1997.pdfIn PDF document text
    • http://velumosak.epizy.com/adobe_flash_player_11._2_android_free.pdfIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_663dd9f5ee1e4fa98ce5eaf3442e9605.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_92d8b8f3542c4420852fbffbd66c50b4.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_92a9c394b64b41039a667d3af88a8585.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_617b96b7219e4c18bb0ddaa91ae68ed1.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_c26ae250da964ad8b0bd83b1a6eb315d.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 5668 bytes
SHA-256: 3804e69a4217c4ac13369a1b949b9a8cb0e55e1a17d76db83fae60fc5af1e297
font_01_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 25972 bytes
SHA-256: 2fecf6255686bac6796f964a4aabeeef0f37cd9c34cf36ca4f1de6f9a5503cc2