Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a45a27f481aa07…

MALICIOUS

PDF

94.0 KB Created: 2021-03-02 20:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cba68dbe76c00682e391d73aa79b2b23 SHA-1: 131b4c099e30147abd8e500000bb14246dc52e1d SHA-256: 35a45a27f481aa07be00f79b607c000fbf00d88665f10e4ff157f876da9d2c52
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

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 0.9998

Heuristics 8

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=netbeans+ide+8.0.2+tutorial+pdf PDF link annotation
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/movosatobobepugav.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/bjdhc04/wexogujaluzupin.pdfIn PDF document text
    • https://cdn.sqhk.co/munemuzabuk/pyPhjji/robzone_duoro_xclean_profi_recenze.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/bUglSKU/80823486883.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/LCgjdha/pencil_box_kannada_film.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/EJiiCHR/faxurib.pdfIn PDF document text
    • http://didavixakodix.22web.org/gangster_game_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/gi1mhdJ/dojorad.pdfIn PDF document text
    • https://jojobejuw.weebly.com/uploads/1/3/2/8/132815094/papawajowimuwadegeg.pdfIn PDF document text
    • https://fufajogaxofamu.weebly.com/uploads/1/3/4/6/134627879/3061903.pdfIn PDF document text
    • http://pajodumu.22web.org/wiliv.pdfIn PDF document text
    • https://lewuseloti.weebly.com/uploads/1/3/1/4/131437615/fafisukoxerex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levumoduf/top_best_android_antivirus_apps.pdfIn PDF document text
    • http://zezunas.epizy.com/hd_wallpapers_1920x1080_for_mobile.pdfIn PDF document text
    • http://xajejewaf.rf.gd/kindergarten_letter_worksheets_free.pdfIn PDF document text
    • http://mupigedosawi.epizy.com/29031503048.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/octopus_apk_pro_2019.pdfIn PDF document text
    • http://kokitivem.rf.gd/fundamentos_de_algebra_lineal_larson_7_edicion.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/breakdown_hollywood_movie.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_off0001309d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309D 5644 bytes
SHA-256: c25970049a8decefd97330648fcaaaff6e5dd5f719f2921ab79128dd4a5b444f
font_01_sfnt_off000143e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E6 11316 bytes
SHA-256: 079ba1e1680c34bcd64a795b5f5f573be6beb076b45c610aa45f56bc024dbdc4

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