Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af119d9eb3e6572…

MALICIOUS

PDF

76.0 KB Created: 2021-03-17 19:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06e0f2ebc5f777255fb893e5f46b12dd SHA-1: 2800e3511ff52fcae334fc2e7dcaa4e37405e399 SHA-256: 6af119d9eb3e657259b7b30ca3d25ef279a4b9adb13c444a91c38192dae070f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing or trojan PDF. The embedded URL points to a site related to IELTS reading passages, serving as a lure.

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://jacksth.ru/123?utm_term=reading+passages+for+ielts+general+with+answers PDF link annotation
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/doremix_nobajuz_zawifevav.pdfIn PDF document text
    • https://saworajopasu.weebly.com/uploads/1/3/0/7/130775294/f61587ad6cb.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/2545981.pdfIn PDF document text
    • https://wunamixexot.weebly.com/uploads/1/3/4/4/134456109/5676423.pdfIn PDF document text
    • https://mofafodoler.weebly.com/uploads/1/3/0/8/130874416/jaluratuv.pdfIn PDF document text
    • https://duguzimelape.weebly.com/uploads/1/3/4/6/134666192/9047350.pdfIn PDF document text
    • https://jixepelisu.weebly.com/uploads/1/3/2/6/132695865/4fb5e.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/jebupofedijakuk/phenyl_chloroformate_reactions_with_amines.pdfIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_cf2c73d789f34ac9aed192dd5ca19c49.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_fa445970496443da8cbe821b9533b541.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_8b10ebf7c5534bcbad2da998d82e2f4a.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_4e9b7d29ba594f40969b2023a670a4a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vajefam/convert_to_kindle_book_format.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/93985878402.pdfIn PDF document text
    • http://worubag.epizy.com/vefanaxob.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/xotasuduxixo.pdfIn PDF document text
    • http://kewoxorewozox.rf.gd/black_theme_wallpaper_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/google_play_store_apps_apk.pdfIn PDF document text
    • https://3a985ca4-c690-46cf-95ae-c4cb01a371c0.filesusr.com/ugd/70c1f8_1c6c8462704742a7a98ac3b41780db9f.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_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 5404 bytes
SHA-256: 53c0231e7907cee598e3c0fda92212c1153876762f738352d06c88ff9f6198ad
font_01_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 11896 bytes
SHA-256: 8885a5276546fe153ae57072156a7b3d2485476dc518096e27523e0a5e6c31c8

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