Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ec8e109c63b5a2…

MALICIOUS

PDF

75.8 KB Created: 2021-04-04 11:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e3d99e0e4b32909d78e307de8202f4f3 SHA-1: f26130db8550a9001d4adb299933b1747567b683 SHA-256: c0ec8e109c63b5a28291aae1f76075af16661299624c12e6f9202883a3ee23c3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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.
  • 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://mezovuduw.ru/wix?keyword=word+whizzle+in+new+york PDF link annotation
    • http://mabixegegixalez.22web.org/37249413822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_603c06e9b5670.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/jehgieG/wudinaxuwusal.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/ieieOo0/konige.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/6qibkq2/bulk_application_insufficient_privileges.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_604b2fe7df847.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/jhKQjii/gambero_rosso_tre_bicchieri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455876/normal_5fc7a5208d3d4.pdfIn PDF document text
    • https://cdn.sqhk.co/tewigoju/ih9zhgo/cardinal_pole_sixth_form_open_evening_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/nNqjage/41653113606.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/fy8FhaK/run_race_3d_online_download.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/fidefofudi/can_samsung_galaxy_tab_s6_charge_wirelessly.pdfIn PDF document text
    • http://tefagagegupavos.rf.gd/english_speaking_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/96850863362.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/dummy_s_guide_to_fantasy_football.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/zagesigelubitap.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_eea7b04c8d44418a865ce0ea84bb38f1.pdf?index=trueIn PDF document text
    • http://bobiwerebidil.rf.gd/guess_the_tv_show_pic_pop_quiz_answers.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_7b8f0ed6b3844eddb19f8f46288258d3.pdf?index=trueIn PDF document text
    • http://nazonuretowu.epizy.com/go_math_book_6th_grade_answers.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_552adbd089f0474c8bd57f14fc85c775.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_5904df6d59ba4686a3b28d4b5b93aacd.pdf?index=trueIn 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_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 4848 bytes
SHA-256: 6f258fd8e4efb719a02e6c7990489381c4ecee97ecf43b6ad3cc8cbfc86eb4ef
font_01_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 10720 bytes
SHA-256: c41b340d78f5496e92967725b093b09c3e0a48a78ece8e1944b03dc3f933f423

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