Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c666fd992f4dec…

MALICIOUS

PDF

90.8 KB Created: 2021-02-12 07:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: df24e9e4c6d83cc657e8dd84d7317928 SHA-1: 9fc20925a246d40c09d762fef2ae0dcf5840e718 SHA-256: a7c666fd992f4dec96b80f7c70402e7c60c3037679030c6ca248fe650dc66f94
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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 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://crophysi.ru/wix?keyword=arnie+states+emily+states+divorce PDF link annotation
    • http://pogadai.xyz/roblox_login_password_freeada6f.pdfIn PDF document text
    • http://fivepazako.22web.org/android_13_int.pdfIn PDF document text
    • http://rigojakivuvemi.iblogger.org/2300338381.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fcba6fc62ba9.pdfIn PDF document text
    • http://elinekici.online/153850434589e2td.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5ff0753746516.pdfIn PDF document text
    • http://nakrutkavk.site/2618245007b0dwx.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/eE97TjR/word_craze_level_726_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/wHNSiih/99398262153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444366/normal_6025b705b479c.pdfIn PDF document text
    • http://hisgohar.site/desert_storm_cards_price_guidenvnal.pdfIn PDF document text
    • http://igcopyrightclient.com/lotuvutopimisuzekuwineduomegi.pdfIn PDF document text
    • http://dnepr24.info/be_at_one_menueupsq.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/jgjdtFh/wechat_pay_users.pdfIn PDF document text
    • https://cdn.sqhk.co/sexobivobufo/fjdj4M9/15491369147.pdfIn PDF document text
    • https://s./s.yimg.com/uu/api/res/1.2/jvXUb.70S_Zbz6gyqivOtg---B/In 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
    • http://visobiwedixupip.rf.gd/makaxavefawoxabibeduv.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_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 5024 bytes
SHA-256: 4f0102f46a30e4b3cdad2f0ef7d3b567fa583c36cdc123d4d0c3362014d28ed9
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 16860 bytes
SHA-256: 2be6b5e1b1fe557e7d4bc9253be3f97082606b3b3487b811ec815eab74923d22
font_02_sfnt_off00013a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A13 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off00014f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F43 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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