Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde8e9b29e56344e…

MALICIOUS

PDF

80.7 KB Created: 2021-03-27 19:35:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aa38174902127599f68ad52ad948e74 SHA-1: ed04362434f15291506da09d0b3ae96570280a9f SHA-256: fde8e9b29e56344e351ad0e52d64f1ecb4761c89463eef53f81b48c317c64a1b
156 Risk Score

Malware Insights

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

The PDF is identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for a link farm. The document body, though heavily obfuscated, suggests a lure related to educational materials. The presence of numerous external URLs, including those hosted on suspicious domains, indicates a potential phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=statistical+inference+textbook+pdf
    • https://cdn.sqhk.co/lapitobexeva/AhbVibV/best_board_games_for_adults_uk.pdf
    • https://cdn-cms.f-static.net/uploads/4427093/normal_601dada23997b.pdf
    • https://static.s123-cdn-static.com/uploads/4385424/normal_5ff56fd8aaa25.pdf
    • https://static.s123-cdn-static.com/uploads/4447271/normal_5ff8a91c4dd3e.pdf
    • http://mastericy-chistoty.ru/jj_rousseau_social_contract_theoryeyw66.pdf
    • http://wwwbcpzonasegura-viabcp.com/guwuvivetiviwufemalusipi68sy1.pdf
    • http://delifeschool.com/gelewurimufqju48.pdf
    • https://cdn.sqhk.co/xurazegoba/SDuidI0/76641084734.pdf
    • https://static.s123-cdn-static.com/uploads/4450732/normal_5ff8542eecfdb.pdf
    • https://cdn.sqhk.co/wunokebewoz/ZuTji8U/rogisezarijolajijegawax.pdf
    • https://cdn.sqhk.co/xufuwejaxe/1ihjhqd/juxemasetinovur.pdf
    • https://cdn.sqhk.co/rekubapapup/HYbSbgf/46759564922.pdf
    • https://cdn.sqhk.co/karopepagu/VEHgeif/98139795849.pdf
    • https://cdn.sqhk.co/zepinima/lDidicz/panic_buddy_end_panic_attacks_download.pdf
    • http://themarkuzmusic.com/operating_system_concepts_9th_edition_exercise_solutions81uj2.pdf
    • https://cdn.sqhk.co/pawiwodogu/krJmun8/vesej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lofese/damien_rice_9_crimes_piano_sheet_music.pdf
    • https://s3.amazonaws.com/rogugagatuf/saloritegilopudumaxe.pdf
    • https://s3.amazonaws.com/wulagisi/solid_wood_study_table_malaysia.pdf
    • https://s3.amazonaws.com/ginutu/84246844215.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/87905456519.pdf
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_fe9b83df5dc94bc5bfa7b3c1fdbafafe.pdf?index=true
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_8067069751e446b4b50ba5ea22cd4198.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ba.bin
cbb52481ce94e16f1aa7c1e5556943e0858c32639ae52c58d7d3596933ba349e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 3016 bytes
font_01_sfnt_off0000fb76.bin
90b984c79e58a93626eda8535c7a2ace4e88ece3787f22dce9c1dadcadfe9c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 5524 bytes
font_02_sfnt_off00010e4d.bin
48ee5fcc91c8c76b6b0a8324180bb93d63b91f7a03a5c2a2ebe3eb70063f479a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 10624 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.