Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ad86309a858e52…

MALICIOUS

PDF

67.4 KB Created: 2021-06-04 17:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b1de2fa750dc3c58927c36a4217c9176 SHA-1: 53162de11482667fb7287363ddab5e2fe06b4865 SHA-256: 35ad86309a858e52bc2ddac774bf170326256b8e6d10c8f93cf3d5393c57e778
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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://garglob.ru/pbw?utm_term=dr+bertothy+st+catharines PDF link annotation
    • https://jaluvipuruwagub.weebly.com/uploads/1/3/4/7/134734890/7150131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503617/normal_6046926cba579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458431/normal_5ff78fd0cc5b2.pdfIn PDF document text
    • https://bazatodeniwumov.weebly.com/uploads/1/3/0/7/130739274/9067d4a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419424/normal_600e4ae5de2be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_605fb86085ea3.pdfIn PDF document text
    • https://javofosuzuvenew.weebly.com/uploads/1/3/4/5/134588543/libus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_601b31d709748.pdfIn PDF document text
    • https://bidubemawekewar.weebly.com/uploads/1/3/0/8/130815124/2c942734762799.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povelin.pbworks.com/w/file/fetch/144420264/43299810178.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144427386/fijinemavivejajanarenimoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8812d48-0a56-4197-911a-7d523d6181a8/is_the_tsi_math_test_hard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22cde151-a9db-4fbf-8150-1fdb1bbac625/30044848536.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144411402/98489508918.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144592413/suzigep.pdfIn PDF document text
    • http://demopefo.pbworks.com/f/50258513212.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144515406/49391213920.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/the_absolutely_true_diary_of_a_part-time_indian_theme_essay.pdfIn PDF document text
    • http://degenazi.pbworks.com/f/writing_balanced_decay_reactions_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4a0c51-e8c2-45c1-b0e0-c4e0c9bdbbdf/where_is_sydney_located_in_australia.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/william_navidi_statistics_for_engineers_and_scientists.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/f/advantages_and_disadvantages_of_increased_life_expectancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c231e13-8524-461f-8bb4-ba93bd7fe0c8/62874019223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d42be9-c927-4b36-b230-e6b26decb992/saving_your_marriage_before_it_starts_audiobook.pdfIn PDF document text
    • http://zewalar.pbworks.com/w/file/fetch/144471813/12006855709.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144459516/financial_statement_analysis_and_security_valuation_stephen_h._penman_mcgraw_hill.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_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 5096 bytes
SHA-256: bc56b14e92d387c22efe584fb10c40b6da6cf31df678ef1eea00be0be36d7746
font_01_sfnt_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 9660 bytes
SHA-256: 5252ff177858e4694a95c0b896c783edef1e82297f8c97f4705e739bdebb61cd