Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2a65cfaa8fe8e7…

MALICIOUS

PDF

610.3 KB Created: 2021-02-19 00:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 85c49c6f049efff3f6afdcab27231195 SHA-1: 70285eb8d3089b3eaea2545f951decf002c035e8 SHA-256: ea2a65cfaa8fe8e7f5312b658d6845e7aba0ce7d90869f805a7badd0fbb4ce8d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/strik?utm_term=infer+why+frankenstein+was+originally+published+anonymously'. This indicates the document is designed to trick users into visiting a malicious site, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7689

Heuristics 4

  • 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.
  • 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=infer+why+frankenstein+was+originally+published+anonymously In PDF document text
    • https://cdn.sqhk.co/jigavozef/eibIrda/43680956388.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/gha6VsJ/island_is_home_survival_simulator_game_mod_apk.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/ketogenic_diet_definitionrf0cd.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/bpLgjIE/street_legal_racing_car_list.pdfIn PDF document text
    • http://kengoru.space/case_in_point_complete_case_interview_preparationqeozz.pdfIn PDF document text
    • http://dream-stat.ru/lightning_link_android_cheats0cho5.pdfIn PDF document text
    • https://cdn.sqhk.co/fomanazoravu/Whcg17z/gumball_darwin_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/pkhfhaj/91710305208.pdfIn PDF document text
    • http://wtia.space/85282501784is7dr.pdfIn PDF document text
    • https://cdn.sqhk.co/wogebebaruro/ekJjBhj/physics_vector_addition_worksheet_answer_key.pdfIn PDF document text
    • http://uaregroup.com/wowilatosawuwefusawafadcz83h.pdfIn PDF document text
    • http://fc-aromat.ru/ibps_po_online_form_fillingeyr1z.pdfIn PDF document text
    • http://workshop-fb.ru/basic_security_testing_with_kali_linux_2_free_downloadhs7rv.pdfIn PDF document text
    • https://cdn.sqhk.co/duravukikemo/iVgieih/school_management_system_dashboard_template_free_download.pdfIn PDF document text
    • http://ru-1.casa/transversal_and_parallel_lines_worksheet_answers_lesson_4-2o5oa1.pdfIn PDF document text
    • http://laulu-go.ru/air_control_valvein9s6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/adblock_fast_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/utorrent_proxy_free.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_off0009384c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9384C 5792 bytes
SHA-256: 75160901925ad7d07206167209fa0b3effbe83e5158492be0e1cdb9dbc7ae7e1
font_01_sfnt_off00094bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94BF9 14496 bytes
SHA-256: 9132a1f59dbc9839ad5d1cf6f79025b400260f48f0980b2fba9d19a3e5e38aeb

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