Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98ee29f3d8dfd97…

MALICIOUS

PDF

84.8 KB Created: 2021-06-08 03:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 28d2c4b3ec011d48da7ff19bfd367edb SHA-1: 0457393e9e6e9bba81380576f51611883dc865f5 SHA-256: c98ee29f3d8dfd979ac59ef0559a2054bb866b6df2d800801185d51adebdc1da
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for phishing or to distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/123?utm_term=informal+letter+english+camp PDF link annotation
    • https://nagozexifetuli.weebly.com/uploads/1/3/4/3/134340384/gemukokedatubev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_5fd630e40258e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424637/normal_604505a8ca5b8.pdfIn PDF document text
    • https://tofoboloronu.weebly.com/uploads/1/3/1/6/131636632/metejan-lokotikur-felugut-sujesano.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/suvogu-xorusokenov-gepefunenivaz-borevofuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384831/normal_5fee3184e2eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_600dc1478d14b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_600aad693293e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_60bd3a30296e5.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/468990.pdfIn PDF document text
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/47d21e4f1a1d4a3.pdfIn PDF document text
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/eed7a85da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_603b9a8e055b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_603b0bcb08d9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_6030fa4750724.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vamafob.pbworks.com/w/file/fetch/144827634/paradise_lost_book_1_line_by_line_translation_in_urdu.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144678534/telecharger_whatsapp_rouge_2019_apk_derniere_version.pdfIn PDF document text
    • http://rubepikonot.pbworks.com/f/8487064568.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 5368 bytes
SHA-256: 0ef138d2ec0d78329452c4a7521c4c57e75630390bec568dead1fff65dcedf6e
font_01_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 11288 bytes
SHA-256: 9abf13002df6fb120d7d66862914a191aeb5139a06e57246a8a43569ecfdbfd3
font_02_sfnt_off000130d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D1 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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