Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d6608c00a82ae8…

MALICIOUS

PDF

141.9 KB Created: 2021-06-02 14:39:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1f7ba941c43bf87fa62ee7645e79e891 SHA-1: de09f3ebe3cc66f50ac261409ecf69b8eca89cb5 SHA-256: c9d6608c00a82ae864cc4d7834cb46cb1da91d6528c5a372ed63036ef06779e3
174 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/pbw?utm_term=latest+raj+comics+free+download+pdf PDF link annotation
    • https://xenapake.weebly.com/uploads/1/3/4/3/134353424/xogesal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5ff4c0c70b55e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_60481fc7056de.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/xenig.pdfIn PDF document text
    • https://zogininofifus.weebly.com/uploads/1/3/2/6/132695288/3b1dd5ee10b3b51.pdfIn PDF document text
    • https://lalazifesulalo.weebly.com/uploads/1/3/4/5/134502535/bfe6f64791c3967.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kevuxezedila.pbworks.com/f/black_spider_xt_tactical_wireless_indoor_helicopter_manual.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/zapiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf25a03-037f-4c53-a447-883e5e1ae907/84072500728.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/free_fillable_printable_family_tree_template.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144426957/how_to_turn_on_wd_my_cloud_ex2_ultra.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/w/file/fetch/144492204/478029136.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144499839/85389309346.pdfIn PDF document text
    • http://siruzosu.pbworks.com/w/file/fetch/144447459/5-6_practice_worksheet_the_law_of_sines_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a12fe1-2733-4daf-9f08-a4051f83bad6/is_the_mixing_bowl_restaurant_still_open.pdfIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144426141/ver_novela_de_rafael_orozco_el_idolo_capitulo_73.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/98395853220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81a0140-6aa3-44ed-ad51-e2b1736987bf/how_to_manage_diastasis_recti_during_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b518ef-8977-4144-a7f2-0d53123d156c/how_to_get_all_achievements_in_cookie_clicker_cheat.pdfIn PDF document text
    • http://xodelow.pbworks.com/f/jixiwaxeris.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_off0001c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6F0 3832 bytes
SHA-256: 82d84e3f7e9c625c2c4ff46a13323c5a1f7789870d4b4d616725823e49cdfb14
font_01_sfnt_off0001d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4BD 5408 bytes
SHA-256: 1d553a623c27a7ac96753906d69487904de1008c8ccaacd43b49b0a81dd78ede
font_02_sfnt_off0001e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E726 12804 bytes
SHA-256: 87977e695bc344f6ed378d83d29f1308b5a035697b0f35a97700c5877d3d7eb9
font_03_sfnt_off000212d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212D1 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90