Malicious PDF — malware analysis report

Static analysis result for SHA-256 769ec54858064ac6…

MALICIOUS

PDF

103.8 KB Created: 2021-03-03 02:36:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 024efc9f61a54a3a01d8a76a1d51b41b SHA-1: 6aa9473e20a5301ac584eb2a5f4cd4ae86028e73 SHA-256: 769ec54858064ac6036d8c66ecc9a329b5e29169b18ccbb900e3b7dc0d3419ce
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs pointing to suspicious domains, suggesting it's designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a manual, a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=echo+srm-2100+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403263/normal_603e3db231779.pdfIn PDF document text
    • http://opticsystem.website/nixijitaranupibotufozizeeg0zm.pdfIn PDF document text
    • http://about-igsupport.com/serdeczna_matkomkzvg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467278/normal_602480742345d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452588/normal_602b5f0948cfa.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/jawbone_jambox_speaker_charger.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449987/normal_5fc5711a3ea68.pdfIn PDF document text
    • http://watertea.space/17712693357oa9lt.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/best_table_topics_toastmasters.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/my_pilot_light_on_my_water_heater_went_out.pdfIn 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
    • https://s3.amazonaws.com/sojaxub/ecommerce_template_react.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/cantharellus_tubaeformis_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/51134588399.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/perbedaan_singer_4423_vs_4432.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/15468662083.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/geduvabufigunenodu.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/cambridge_english_pet_exam.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/how_does_time_capsule_work.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/toxidexazabizale.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00010f1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10F1C 21560 bytes
SHA-256: d0f4e774bdb4de6edb9b52884170bb73e7438820a177f9b816c74f7362212923
font_01_sfnt_off00014dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC4 5348 bytes
SHA-256: 321cc1db9cb9cd0413296c8ea0e7fe76864fbe8d5f5cd3d5cd2e21fafed87735
font_02_sfnt_off00015fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBD 10508 bytes
SHA-256: 98be241dbfdeed503c79c653efae385c474633ba4cbb6c146c8424150d20be48
font_03_sfnt_off000183be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183BE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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