Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3a7ca7ef00a024…

MALICIOUS

PDF

72.0 KB Created: 2021-02-19 00:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 49891b10c9a306c5efa9de4e60c9176f SHA-1: f59f89df57b412fd2dbe5c057c463c361e02e215 SHA-256: 9d3a7ca7ef00a024fb441a312c75059a776cc0c5d232b0cd3069d32bd0d3dad7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the heuristic firings and URL analysis confirm the document's role as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=constant+mesh+transmission+motorcycle In PDF document text
    • http://potolkilife.ru/dpwh_school_building_plansnxpbs.pdfIn PDF document text
    • http://inostrana.com/gijagivofonuxiz9ryqh.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/iWNjgjh/game_dev_tycoon_2_apk_free_download.pdfIn PDF document text
    • http://bonifacy.site/72350652318kqvbp.pdfIn PDF document text
    • http://geosen.net/author_s_purpose_entertain_persuade_inform_worksheetsoie6m.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamujigip/dgfNBii/52112467081.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/ihijcAP/pofidevowu.pdfIn PDF document text
    • http://prizinsta.site/idle_slayer_weaponsq4x88.pdfIn PDF document text
    • http://sokfresh.fun/exercicios_de_torque_e_alavancagxs7a.pdfIn PDF document text
    • http://slimitalia.space/taux_interne_de_rentabilit2unhg.pdfIn PDF document text
    • http://goodsun.fun/creeped_out_parents_guideushti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5ff190e704389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5fda942b952f8.pdfIn PDF document text
    • http://bestita.space/738694286744a8vb.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/pegozegi/95812895935.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/tcu_undergraduate_guide_book_2019_20.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/61369543809.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD192 4952 bytes
SHA-256: 8b7641a9ff5adbd01201fec2c1ad313e7e17bd4396c3cca549ae7ef1b06d0cce
font_01_sfnt_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 10176 bytes
SHA-256: ee1681e014d09fa2f0a73c67a20f56bd883c62593d33982eb459458e49dbc288
font_02_sfnt_off000104d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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