Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a301df9a5b431b…

MALICIOUS

PDF

76.7 KB Created: 2021-03-13 23:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 74417ffdd81f87f2e9d1173e48d1e424 SHA-1: a0d4f764915f2bbf8f3d210102310a0126b7c6b8 SHA-256: 53a301df9a5b431b1fd0e137f6b049b5763121cf651d7c207f39c441fb63789c
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically pointing to 'crophysi.ru'. The document body, though heavily obfuscated, suggests a lure related to performance reviews, a common phishing tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crophysi.ru/wb?keyword=what%20not%20to%20write%20in%20a%20performance%20review In PDF document text
    • https://static.s123-cdn-static.com/uploads/4407991/normal_6001203fdac12.pdfIn PDF document text
    • http://dedotiroviwef.22web.org/8911814070.pdfIn PDF document text
    • http://optamorem.com/zagag2r6er.pdfIn PDF document text
    • http://stopnutristrike.ru/how_do_i_setup_my_netgear_wifi_extender_ex6110nh0ei.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_601b00405e934.pdfIn PDF document text
    • http://50offit.pro/acceder_a_icloud_via_androidolv9r.pdfIn PDF document text
    • http://italy50wow.pro/similar_figures_word_problems_worksheet6q2uh.pdfIn PDF document text
    • http://diporesorojina.scienceontheweb.net/zubotujudowuzuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_60469d4b95728.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/40078472463.pdfIn PDF document text
    • http://probmake12.xyz/dj_private_audio_songs_naa_songs5aum1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418791/normal_5ffcfdc2b11e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5fe99528a2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/tabuketibufu.pdfIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/bargaining_for_advantage_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/zutiz.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/44351625754.pdfIn PDF document text
    • http://lewimidofi.epizy.com/crossfit_wod_chest_workouts.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/warcraft_3_burning_legion_map.pdfIn PDF document text
    • http://tatefubuzu.rf.gd/59011413522.pdfIn PDF document text
    • http://vawobalen.epizy.com/kiwanifaxi.pdfIn PDF document text
    • http://litorow.myartsonline.com/epidemiologia_clnica_elementos_essenciais_fletcher.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 5208 bytes
SHA-256: d7464f3ce3d222f5854fd513b5e05dcc16013a364f58d60d8203359df2e62619
font_01_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 10408 bytes
SHA-256: cfa7b7daacce77bbbc03bd2feafe04cd41e2d8c849a352a2b5765d7ec65544e6

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