Malicious PDF — malware analysis report

Static analysis result for SHA-256 873e9d2daf95f9cf…

MALICIOUS

PDF

95.1 KB Created: 2021-03-16 19:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 66e9f329526a85c9aab50a8b7bbfecf0 SHA-1: 2283274f9c8056b419789102d2ed31fa216ba7ba SHA-256: 873e9d2daf95f9cf5aef03ed708ec1a07528b08cc637488f8ba498c373f018e5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to educational materials, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/wix?keyword=big+ideas+math+course+1+chapter+5+test+answers PDF link annotation
    • http://uber-global.com/doravvhy5o.pdfIn PDF document text
    • https://botimosiwipam.weebly.com/uploads/1/3/1/3/131398053/xobepud-gixakizawirumur-setifazapopoj.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/32735103013dv6xv.pdfIn PDF document text
    • http://serviceforyou.site/52788465891ti249.pdfIn PDF document text
    • http://avit0.cc/stock_market_for_beginners_books0q7l2.pdfIn PDF document text
    • http://tryadasert.online/nexonzrvux.pdfIn PDF document text
    • http://goods-amzon.com/28099960361i5scu.pdfIn PDF document text
    • http://linza.media/66337531243fvkhs.pdfIn PDF document text
    • https://nirilixurem.weebly.com/uploads/1/3/4/4/134474770/0b723e663.pdfIn PDF document text
    • http://pedron.fun/messenger_version_for_android_4.4.29mbyq.pdfIn PDF document text
    • http://verification-help.business/weezer_i_am_the_greatest_man_that_ever_lived_lyricsy79j5.pdfIn PDF document text
    • http://faketikus.22web.org/progressive_assessment_test_questions_and_answers.pdfIn PDF document text
    • http://it50off.pro/dasumekod7uwua.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/paxivogedewilu/rheology_of_fresh_high-_performance_concrete.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/tofoselisadowo.pdfIn PDF document text
    • http://xaramoturowuf.rf.gd/zusifimasi.pdfIn PDF document text
    • http://jepisaf.epizy.com/hallelujah_sheet_music_choir_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/zmodo_audio_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/what_are_the_3_types_of_structures.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_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 5772 bytes
SHA-256: f948e636418f3891cd62c6386fb5e459f456bfb04d062f12804e3bf68892ae9b
font_01_sfnt_off00012bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCD 14104 bytes
SHA-256: b9bd9003b123f11a722d6816fa3d0d976bc4aedba436330c92283d774a015b34
font_02_sfnt_off000158f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F4 16164 bytes
SHA-256: a61d1f4172763a41c60f30d40c843f2f67cf3d6251427f483723f70537d98cd8

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