Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb8790cdac3fef7…

MALICIOUS

PDF

77.3 KB Created: 2021-04-08 07:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cdd1f5ed2d6594e9f051552d755e7133 SHA-1: f0a48050445b7d4e1e05eb64627700e18b978ab6 SHA-256: afb8790cdac3fef7052bbe8d159659d1a81c7fa4f75da0512f19af0652dcb3db
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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=school+detention+rules In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_60141545f0939.pdfIn PDF document text
    • https://cdn.sqhk.co/keximovib/ghOhajh/64901779045.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/zitund5126.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/jUrgyrX/74288099816.pdfIn PDF document text
    • https://cdn.sqhk.co/fabukujeb/hDgfvCu/musicals_on_broadway_2019.pdfIn PDF document text
    • http://sparzha.club/free_picture_composition_worksheets_for_grade_4sjsul.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/gramatica_portugues_brasil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486206/normal_5fc9322e62792.pdfIn PDF document text
    • http://seplafond.xyz/cub_scout_bear_requirementshc6x2.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/como_baixar_em_iphone.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/the_backwards_law.pdfIn PDF document text
    • http://kofuxasapaduk.iblogger.org/evermotion_archinteriors_vol_36.pdfIn PDF document text
    • http://avlto.best/hp_27q_pavilion_27_qhd_monitor_review52lrf.pdfIn PDF document text
    • http://xujaxul.mywebcommunity.org/dialysis_technician_resume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_60608bf3b5ef2.pdfIn PDF document text
    • http://gosepakaf.getenjoyment.net/18808296541.pdfIn PDF document text
    • http://love-your-lips.online/sat_practice_test_1_answer_explanationsodw40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gajutar.onlinewebshop.net/editable_bingo_template.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/addition_without_regrouping_worksheets_for_grade_1.pdfIn PDF document text
    • http://fekejuw.atwebpages.com/arabian_nights_stories.pdfIn PDF document text
    • http://bitines.myartsonline.com/divovozi.pdfIn PDF document text
    • http://teveniwavabubak.rf.gd/90207483889.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_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 4920 bytes
SHA-256: 29387cbe077bd279b730daaeb83967e291a5c2d9d5f6391bc94727b7f278292f
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 10480 bytes
SHA-256: ce4c2818a9948f318c3c221877583d243c5cee59473b3fcd62043ea2d8848bd9

Open this report in the interactive analyzer, or submit your own file for analysis.