Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a5b689dabe888e…

MALICIOUS

PDF

74.2 KB Created: 2021-03-04 02:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a1a08b2a4d0597f449622ec5a72083ac SHA-1: 9307c903e4c38dfad4ffc4f96c8b7f88fff1473d SHA-256: f3a5b689dabe888eea1fcaf16a5c6a4896a4e61e1ed1194700ba2778a2d5b17f
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a keyword suggesting it is an answer key for a 'world war 2 review sheet'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of a malicious URL suggest it's designed to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://dafemum.ru/wix?keyword=world+war+2+review+sheet+answers In PDF document text
    • http://get3creditscores.info/jbl_flip_3_portable_bluetooth_speaker_specifications8p1mz.pdfIn PDF document text
    • http://pomirkapa.site/damesagoxidasa49xzs.pdfIn PDF document text
    • http://reactivascotia2020.com/79401824109tvn9p.pdfIn PDF document text
    • http://tegor.xyz/gajuzogizemobib01wr3.pdfIn PDF document text
    • http://bonmarket.site/advanced_database_management_system_notes_for_mbadz89c.pdfIn PDF document text
    • http://roralopokuzej.22web.org/olympus_social_network_psd_template_free.pdfIn PDF document text
    • http://garant-ritual.online/kenatofanitagiyxm8i.pdfIn PDF document text
    • http://drovazvenigorod.ru/vofiwuxoxunrcph.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vozotokunu.rf.gd/android_apps_free_apk_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/10952695393.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/xelisitodoperevesikagode.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/1125630255.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/christs_college_uniform_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/pre_ap_geometry_worksheet_cpctc_proofs_answers.pdfIn PDF document text
    • http://babudenipovux.rf.gd/tanoviga.pdfIn PDF document text
    • http://defisunukotizid.epizy.com/attack_on_titan_season_3_part_2_dub_release_date_funimation.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/9422892725.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/53763484322.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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5208 bytes
SHA-256: 11b1ed16c17de14d565e92e18a3de4ce3fd9c4251eaed05ce83c6ffeb5b84873
font_01_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 10240 bytes
SHA-256: 07c698d11d19c430f94f084a5f017fbf26d23302b575f8c54fe4ffa3bc79d9e8

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