Malicious PDF — malware analysis report

Static analysis result for SHA-256 147530369d928558…

MALICIOUS

PDF

81.5 KB Created: 2021-03-18 11:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ed50fa0a2918648797a012f0d8af8135 SHA-1: 8ed36fe74a34a042de9d5f4cd739d26292c008a4 SHA-256: 147530369d928558e1fbf7826903ba0fc95f5dff528e4a3921fcb878c5ad643c
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 0.9996

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://baarspo.ru/123?utm_term=adjective+and+adverb+phrases+worksheet PDF link annotation
    • https://jatupixi.weebly.com/uploads/1/3/1/3/131398141/tarirajofiraxav.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/36989601110.pdfIn PDF document text
    • https://nevipezuke.weebly.com/uploads/1/3/4/6/134652321/6734152.pdfIn PDF document text
    • http://goodnatural.space/sonic_flash_game_unblockedow1pw.pdfIn PDF document text
    • https://gitizurozid.weebly.com/uploads/1/3/0/7/130775734/53cbc29575c00a.pdfIn PDF document text
    • https://zupakikaxabu.weebly.com/uploads/1/3/1/3/131380404/88b26cbdfcfd0.pdfIn PDF document text
    • http://bigowet.xyz/86077368932tm1k2.pdfIn PDF document text
    • https://molesorip.weebly.com/uploads/1/3/1/3/131381109/7ee8a597.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://maxefaronuxugur.epizy.com/tumuputiporowas.pdfIn PDF document text
    • http://kivekogifix.epizy.com/jiluxuwanejadonodeped.pdfIn PDF document text
    • http://vivetusukuv.onlinewebshop.net/cavalier_96_coke_machine_for_sale.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/writing_self-assessment_essay.pdfIn PDF document text
    • http://fariwugakek.rf.gd/sig_sauer_p226_legion_rx_full_size.pdfIn PDF document text
    • http://dejarovagozude.epizy.com/luciferase_reporter_vector.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/69745347574.pdfIn PDF document text
    • http://rabuwupitakif.rf.gd/album_songs_tamil_ringtone.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 5340 bytes
SHA-256: 3f0df36b8ef39af1716291619d284d7e186c767ff2cbb467fea6eff4a4803bdb
font_01_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 11128 bytes
SHA-256: b813a5644b74e91b6399ee5ab0df2b1f27627a4190436f97e14df957b58540b2
font_02_sfnt_off0001158d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 16104 bytes
SHA-256: 1eb1a67c1e28174fcd3182c8c51ea08124a48e64646cffb6854bb4c979508c4a
font_03_sfnt_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361