Malicious PDF — malware analysis report

Static analysis result for SHA-256 b331257f625e8dad…

MALICIOUS

PDF

86.0 KB Created: 2021-03-14 04:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4099ed4c2180c7e9a9a67b2f945117bf SHA-1: 14a8ba378c519dee067164c9470abbb6a447b477 SHA-256: b331257f625e8dadf76b293f65cf9dbd109b52ca0bc0ff8babf56defb951ad4d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, with one prominent URL leading to a domain associated with phishing and link farming. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'carson mccullers books pdf', directing users to a suspicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://gimoguvi.ru/award?keyword=carson+mccullers+books+pdf PDF link annotation
    • https://cdn.sqhk.co/vemegunir/jfOgfih/loop_king_county.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_5fd1cd40917f9.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/01PCidg/88907475947.pdfIn PDF document text
    • http://pumorux.medianewsonline.com/80457302542.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/idZZwBk/mininu.pdfIn PDF document text
    • http://gijaninapumobe.sportsontheweb.net/gorudabosajemogowopupozoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5ff32eb0e7e59.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/4ifijie/super_nintendo_mario_kart_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/gdhhl2h/.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/jiruw.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/WKrO9YQ/word_pets_free_word_games_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/yeujihc/unity_3d_racing_games_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_60129cef09d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_603013c764543.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/jbhbghD/korulon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/radubozufiwo/pedexijinunupugefori.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/50328415721.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/63220795662.pdfIn PDF document text
    • http://gozidonozali.myartsonline.com/pepivuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/is_christian_private_school_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/mandated_reporter_form_louisiana.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/56917273282.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 5284 bytes
SHA-256: 37fb68ef8ef416d6c8828f8c3465514a5f79e7b5cb3d28625607e60cebb65938
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 11932 bytes
SHA-256: 6235c461d61aef3b7bff13f078d9fc8a11e65781a95d3b54a9d67983654b4de3
font_02_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 18016 bytes
SHA-256: a1b919d827a48b181fb14c432e511332372ec8774930b06c16a654a47aaa0bc7
font_03_sfnt_off00013c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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