Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bb5c43251d0732…

MALICIOUS

PDF

80.0 KB Created: 2021-02-02 02:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4449bbfaad6ecaad8fc315484d2535f3 SHA-1: 3cba85c1f08659f2ffc342e385817537611023ca SHA-256: b9bb5c43251d0732aa50fbdb89147ff69e59537849d2be80be3804642ca3093f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to suspicious domains and are likely part of a link farm designed to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/aws?utm_term=apa+citation+machine+pdf PDF link annotation
    • http://brosbass.com/41865609118s92zi.pdfIn PDF document text
    • http://stal-kemerovo.ru/rush_limbaugh_radio_stations_californiagrz4k.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/jfMtjaZ/sezapaf.pdfIn PDF document text
    • https://kotasixunepa.weebly.com/uploads/1/3/0/7/130776076/patafemavegunedifi.pdfIn PDF document text
    • https://xenimaxifoja.weebly.com/uploads/1/3/1/4/131483144/26dd20a.pdfIn PDF document text
    • http://2gusevshop.space/28958717146swi5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465125/normal_5fe3fc31b9b41.pdfIn PDF document text
    • https://cdn.sqhk.co/tizudukokeni/lJshajc/basketball_arcade_machine_for_rent_philippines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458633/normal_6008a8b1f382c.pdfIn PDF document text
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/besugulewokuzoromuxa.pdfIn PDF document text
    • https://wurixexaf.weebly.com/uploads/1/3/4/8/134865586/9418677.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
    • https://s3.amazonaws.com/wesezuzuvalirik/free_clickfunnels_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/asuran_songs_bgm_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/batman_beyond_batarang_template.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/52755980022.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/sowuzomofobutovo.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/informacion_de_los_chinampas.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/komizajejame.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 4864 bytes
SHA-256: 89eeb5669f1129cd642c8b6e4e7e5028998283d8d988954934a974f259b3d7db
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 10448 bytes
SHA-256: d63b5fc4e4438ea0f9ea68e197e61ab8d22f2e57d0146527eb5321eb68704f1b
font_02_sfnt_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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