Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58bc21dabec8ad5…

MALICIOUS

PDF

77.9 KB Created: 2021-03-18 09:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c5e1a408a8611378601fe5cea8d16831 SHA-1: b043f6656c4db95d8624380eeaae1308f3d3395f SHA-256: d58bc21dabec8ad55bed10d9e321572d95fb17fdae122a2683db4094fb3772ac
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is classified as malicious by ML and ClamAV. The primary malicious URL, 'https://pelibifir.ru/award?keyword=design+patterns+c+with+examples+pdf', is presented in a way that suggests it's a search result, likely to trick users into clicking it. The document body, though heavily obfuscated, contains metadata related to PDF creation, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/award?keyword=design+patterns+c+with+examples+pdf PDF link annotation
    • http://podorokufexapal.iblogger.org/gutovudepedagijom.pdfIn PDF document text
    • http://fikepoj.22web.org/best_picsart_editor_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/wvjcrjb/internet_video_er_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/h2giggf/limbo_game_download.pdfIn PDF document text
    • http://gisisavodure.22web.org/8220393016.pdfIn PDF document text
    • http://wizomokupelew.iblogger.org/application_for_loan_from_office_format.pdfIn PDF document text
    • http://difemetudanad.22web.org/kepiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/sjggdgz/cafe_racer_for_sale_craigslist.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_79b4e28e8f124b11b422f3d081926fea.pdf?index=trueIn PDF document text
    • http://noxoxuf.rf.gd/what_is_ertugrul_ghazi.pdfIn PDF document text
    • http://xakexuxav.rf.gd/67864510761.pdfIn PDF document text
    • http://zoguritekide.rf.gd/xewan.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/email_address_list_template.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_2fe6832e911e43efaa946c115ba81932.pdf?index=trueIn PDF document text
    • http://nelifofufotilep.epizy.com/jikixujemuxela.pdfIn PDF document text
    • http://bozalusi.epizy.com/letter_format_change_authorised_signatory.pdfIn PDF document text
    • http://nivufebolira.epizy.com/bericht_schreiben_grundschule.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/48847617654.pdfIn PDF document text
    • http://xodibux.rf.gd/sagirukoluwokak.pdfIn PDF document text
    • http://vejawogi.rf.gd/zawijilojudunivedabixos.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_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 5728 bytes
SHA-256: c1f4e456dc41618daacc44d230d607114e8e7871435d780dd44ebeca9ccda063
font_01_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 11804 bytes
SHA-256: 6351d57935d301317881efd96cf6018b8aa49748fb0f58ec65b8e596047b647a

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