Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f773edaa2bdaac…

MALICIOUS

PDF

80.1 KB Created: 2021-04-02 15:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1fdbe49d9bbe9ee04ffcdafc65e334dc SHA-1: 976a200553f84c8e2a1b484a538aa8e0b3b1c4ca SHA-256: a9f773edaa2bdaacb849e54485ac618da1e7a0fd2b11f19591432f10fa95fac8
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to disposable hosting, suggesting a link farm or phishing attempt. The embedded URLs are likely intended to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=atlas+of+human+muscle+anatomy+pdf PDF link annotation
    • http://gemajesubon.22web.org/free_printable_end_punctuation_worksheets.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/5_articulaciones_del_hombro.pdfIn PDF document text
    • http://telozurilesojo.sportsontheweb.net/modele_attestation_de_domicile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_6017ab9b9a923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407749/normal_5ff4c0bbc5689.pdfIn PDF document text
    • http://regirukux.iblogger.org/angularjs_7.pdfIn PDF document text
    • http://pirunumilusarib.sportsontheweb.net/78739917291.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/acIWu2h/1878413977.pdfIn PDF document text
    • https://cdn.sqhk.co/xutujipux/dCcgdC4/tik_tok_video_players_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486344/normal_603506dec917a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_6011e5018fb34.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/hfpgggd/debokobizetojamiwifedojo.pdfIn PDF document text
    • https://cdn.sqhk.co/pewesopefim/m4ge7ih/97660737960.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/RjeqWhd/halloween_wallpaper_desktop_pinterest.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_6040d56174f33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_3193e545b58f48a4a5c9bcbc4006311b.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_dd12581025c1470fbf923ec0f43d8199.pdf?index=trueIn PDF document text
    • http://gisebebego.rf.gd/how_to_stop_smoking_allen_carr_free_download.pdfIn PDF document text
    • http://bakenexiradofo.epizy.com/mi_caballo_mago_english.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_6b9752d6abe54def923541e3df756cbf.pdf?index=trueIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_6b46436dd4a44c539db078a431d96680.pdf?index=trueIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_032fa15106aa4e60a3e3eaba98aa0519.pdf?index=trueIn PDF document text
    • http://wupenokisu.epizy.com/wufotiwijepuxonopaduku.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_e6af2e4ae5a040149affe3a5b07b3760.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_8133d4b2845e486f8e0051900cf0b035.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_d25b2566a22f470d81ff84a5123876eb.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_150db614f8fb49debd646543b49f34ac.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_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 5392 bytes
SHA-256: 632ccc7daec5ff7f0f80d844dd48d2deb89b1a5e6f1784344b8703cb8eab11d1
font_01_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 10148 bytes
SHA-256: 7608f48516055d1492396f39d0ad3ce7173adda72cb16ab7c7776b0f44be8f6c