Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e67166897b1b12…

MALICIOUS

PDF

73.2 KB Created: 2021-05-02 16:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8380989d20f14571bc6a3e574179b93e SHA-1: 96243a821363e24640eb5486514d6e894bdbf36b SHA-256: d4e67166897b1b12ef24872e0d6023ce87c11fd8ccd1ac0c3ba9734545682ab4
156 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 0.9998

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://fokemale.ru/strik?utm_term=paracord+knots+book+pdf PDF link annotation
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/movimifefi-repuseripat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_60262d5952729.pdfIn PDF document text
    • https://turoliletipusu.weebly.com/uploads/1/3/5/9/135969349/c5e76d94fdc.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/Am4eiig/simple_reversionary_bonus_calculation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465403/normal_600fe1e68cae8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_605f96f7b767d.pdfIn PDF document text
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/kidezuxifodedimid.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/8Xgg6id/tejiririburenexobod.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/SEjczjg/fun_words_that_starting_with_n_math.pdfIn PDF document text
    • http://lozajakar.iblogger.org/subject_and_predicate_worksheets_for_grade_7.pdfIn PDF document text
    • https://vuzowukuz.weebly.com/uploads/1/3/0/8/130814197/kodilimor-tozajepas-dolafavizetu.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/wupuxus/levamajopula.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/naming_alkyl_halides_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/alleynes_academy_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/99415235084.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/2018_december_act_form_b05_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/evaluating_indefinite_integrals_worksheet.pdfIn PDF document text
    • http://zapudeni.epizy.com/dd_adventurers_league_character_sheet_spells.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 5320 bytes
SHA-256: 77af80ad1dda953f4f74a9e6dac9979dde98fd62fc10e20caf5075819d8aa022
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 10756 bytes
SHA-256: 7144f4ad65ce6d7e13daef629ff6b597e77b8cd78a4f3f5d757fff8b068579f3

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