Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b04a95d8f2860f8…

MALICIOUS

PDF

85.8 KB Created: 2021-04-07 09:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d3243be72ceaa2bdd80422a5c747280 SHA-1: 9e6d8cb310830dbe36ae0c88eb3aca6dfe1ee5fd SHA-256: 4b04a95d8f2860f82ae1b8c0f4dc0d0e9ef7a44017c7f7c238fd20948e629517
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=chia+s%25E1%25BA%25BB+m%25E1%25BA%25A1ng+wifi+tr%25C3%25AAn+android
    • http://excschool.ru/alter_ego_names_examplesz0f80.pdf
    • https://pixizibonemitu.weebly.com/uploads/1/3/1/3/131382366/miwigiforupunef-pagulamo-jipajuxob.pdf
    • https://cdn.sqhk.co/tokexinolelu/ibbg0jc/vanafijixikin.pdf
    • http://jakor.pro/60762484499s7f8p.pdf
    • https://cdn.sqhk.co/kezomerameki/iWxgi8O/gorillaz_albums_ranked.pdf
    • http://dk-inc.xyz/58340394262iwbaw.pdf
    • https://cdn.sqhk.co/jepivitixiwo/hcEifig/end_of_term_meme_funny.pdf
    • https://cdn.sqhk.co/kizafizutuw/mAGjeyY/gidur.pdf
    • http://kursi--kosmetologs.site/mixojoxagotopubuy9a8m.pdf
    • https://nelovemisero.weebly.com/uploads/1/3/4/3/134347795/litumoxi.pdf
    • https://cdn.sqhk.co/xovikojux/chiehiR/kezusudolakiboxolirisira.pdf
    • https://nikibowo.weebly.com/uploads/1/3/4/3/134354591/103263.pdf
    • http://lofitner.buzz/wu_tang_saga_episodes_season_2g9sv8.pdf
    • https://cdn.sqhk.co/jaziwuke/iehgGic/jepebofurodub.pdf
    • https://cdn.sqhk.co/fasisela/5UYic6I/followership_meaning_in_nepali.pdf
    • https://cdn.sqhk.co/patagarinixa/i4DjaNW/43062291845.pdf
    • https://cdn.sqhk.co/woxemumi/YHVjdjh/planet_defenders_board.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/81ddefa6-df65-4579-ad5c-961ce097a7f6/50031862695.pdf
    • https://uploads.strikinglycdn.com/files/cdbde995-94d0-448b-8113-96add065384c/xakezinefezoxenid.pdf
    • https://uploads.strikinglycdn.com/files/cce0e897-3d2a-437f-a21e-cdb0c3e6f961/sibukezewevematej.pdf
    • https://uploads.strikinglycdn.com/files/8d309932-ddf6-40d4-9c44-2cf0648fd385/9309390217.pdf
    • https://uploads.strikinglycdn.com/files/b87874ec-4702-4ae4-b570-f1c415cfcc9b/papirosawowivomajusefe.pdf
    • https://uploads.strikinglycdn.com/files/f475b348-8209-4809-bc33-69468a321937/mejores_frases_de_el_amor_en_los_tiempos_del_colera.pdf
    • https://uploads.strikinglycdn.com/files/9e0b9034-b348-4448-bedf-2f7ed1d98470/63649846318.pdf
    • https://uploads.strikinglycdn.com/files/4110b7b2-3e60-4c7f-8a39-2e331d5154f8/calories_in_chicken_taco_salad_without_shell.pdf
    • 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_off0000f45a.bin
cfd30b4b256df3c6ea15cfcc1ab39f9bdb447fe0b75d49d7072fa9600bbacf3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 5624 bytes
font_01_sfnt_off0001068b.bin
9e47c341e33e545b95398670fa62f6606696ae6634fc48cdc9061558ea4ee35e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 23096 bytes
font_02_sfnt_off0001396d.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1396D 4324 bytes

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