Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd03afebf19504d1…

MALICIOUS

PDF

72.4 KB Created: 2021-02-16 01:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6812aa7e9958cc91592b194ead0d1679 SHA-1: 1e9de4959f3d8f9aa1931ec7cf05b84b6b24337c SHA-256: fd03afebf19504d11168d1a4485ed7b2050de40c7db2f04b9c9eaa2224450f19
184 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML and ClamAV, and contains links to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a 'Ravpower filehub wd01 manual'. The embedded links, particularly to 'yafferge.ru', suggest an attempt to redirect the user to a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=ravpower+filehub+wd01+manual In PDF document text
    • https://cdn.sqhk.co/retobumoki/bbieERt/lalazorekowuk.pdfIn PDF document text
    • http://xonibiz.22web.org/2014_cadillac_cts_2._0t_owners_manual.pdfIn PDF document text
    • http://suleluzapu.iblogger.org/xamozisalijizud.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/jijcidn/best_lock_screen_shortcuts_android.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/xijuxosisomuna/power_blackjack_strategy.pdfIn PDF document text
    • http://surifuj.rf.gd/animated_template_for_powerpoint_presentation.pdfIn PDF document text
    • http://wefazerigibu.epizy.com/descriptive_statistics_journal_articles.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/66570795298.pdfIn PDF document text
    • http://xifonefoje.epizy.com/rivalet.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/booth_multiplier_algorithm.pdfIn PDF document text
    • http://pasemox.rf.gd/alumni_association_registration_form_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/nccn_guidelines_lynch.pdfIn PDF document text
    • http://xikisefux.epizy.com/cubes_and_cube_roots_worksheet_answer_key.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/aggiornamento_abox_android.pdfIn PDF document text
    • http://nesitojogosew.epizy.com/wijidafugubu.pdfIn PDF document text
    • http://lenadupubop.rf.gd/60599941999.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_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 5596 bytes
SHA-256: 1508e8eff391e6186ec09ca007f2494ee489266ef143f741f0bc667824feeebe
font_01_sfnt_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 10872 bytes
SHA-256: 6d7efd064e0a2aeea02d87cddfba74b50f1baa75c0433703ff1e649a53807a84

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