Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a4f21bdef1da3b…

MALICIOUS

PDF

79.1 KB Created: 2021-03-07 08:35:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: eba12ff47e86d17b27ad2664d36ad6a0 SHA-1: 6224bc5e2cb94b94f41b43b681c0fc6bb58c1b20 SHA-256: 21a4f21bdef1da3ba57f9e385faa98f9c233915085eeb5473a3d8e4cc0d2894d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to clothing sets, which is then redirected to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=father+and+son+clothing+sets+in+india In PDF document text
    • http://foyou.store/microsoft_word_golf_tournament_flyer_templatea12h1.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/zozevojavap_lobupifulija.pdfIn PDF document text
    • http://quickpapp.online/11616854959ziomt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5fdb531abe720.pdfIn PDF document text
    • https://lagisarer.weebly.com/uploads/1/3/4/1/134131240/752c43d2207246d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_600ac8bbe8cdf.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/27c08a9bf2d8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5ff4a605d96de.pdfIn PDF document text
    • http://bezigex.iblogger.org/xaxewukubalafaxufituli.pdfIn PDF document text
    • http://vorusobowa.66ghz.com/tiwujemaludakedog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_6027a00b99729.pdfIn PDF document text
    • http://donbetosstreettacos.com/768023610791fef9.pdfIn PDF document text
    • https://roboxojepuz.weebly.com/uploads/1/3/4/2/134235986/8619982.pdfIn PDF document text
    • http://indonesia2health.online/kreg_mini_jig_user_guidebpi4x.pdfIn PDF document text
    • http://ledimpress.biz/isabelle_s_research_dilemma_answers_pptdo861.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
    • http://mesesoriran.epizy.com/bookworm_adventures_pc_game.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/sanwa_multimeter_analog_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84cf97d6-570d-41a0-80fa-a68f6ee167eb/60307700338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ed7c08-3f36-41d6-8b84-47d6378aa7ca/71547953560.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/race_ethnicity_and_sexuality_nagel.pdfIn PDF document text
    • http://wajodojizofe.epizy.com/android_automation_engineer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/decc46dc-6c67-4c59-9e98-49ae5280c185/wekotajubapofowosaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/987643f9-cdc6-4183-a3c5-407b82d988f1/93159818418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16e23747-c8b0-43d0-8aa3-cd8fa5820e2e/didd_provider_agencies.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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 4944 bytes
SHA-256: 84d79fc1b2fe4d6adaca2c5ae9568fb69a09aca207a7e36c62612b4c7acd5e4e
font_01_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 10924 bytes
SHA-256: a389399bd944b130b1f1fd47c5b4b2bbf95a639f089b04169549517ce9ebb3a7
font_02_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c