Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d1c20e2fe489cd…

MALICIOUS

PDF

76.9 KB Created: 2021-03-20 21:28:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c6554c0988df020aeee56d6ae5c7fd33 SHA-1: d98f814ae7b00277d6160dba62e3d66a0048ef2f SHA-256: 19d1c20e2fe489cd4bff227c72b0e12306e639dab30ec1c6bfda995ca2fc9062
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to PDF files, characteristic of a link farm or SEO spam. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. The embedded URLs suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+to+open+sentry+safe+cash+box+without+key PDF link annotation
    • https://cdn.sqhk.co/manaruparil/vBjc8bn/85819399868.pdfIn PDF document text
    • https://sivikowililip.weebly.com/uploads/1/3/4/5/134599649/karol-gemoxukofevom-xonipe.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/jigfa0K/jumanji_2017_trivia_questions.pdfIn PDF document text
    • https://nolopatemima.weebly.com/uploads/1/3/4/5/134583633/7591498.pdfIn PDF document text
    • https://cdn.sqhk.co/rujuwawuju/pijxzhe/sejikajamuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/mazonixun/PhiSjdX/spiral_notebook_with_pockets.pdfIn PDF document text
    • https://gobadinemi.weebly.com/uploads/1/3/5/2/135299992/kelegejo_jukopuv_buluwotajepu_jawipilonap.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/6jjHUjb/driving_school_2016_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dfab95f-5532-452e-be4e-e07efc6dea98/zurowezutumanujige.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/arpan_movie_full_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/97654177056.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/63493150130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6a6fc0-6538-4155-90f1-f0158539235e/xafepuzod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc86041-a940-40f8-8a69-05b063a2bfd7/41977253163.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/poposezo.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/block_rosary_guide_tagalog.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/rebadanos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858a7a8d-5e4d-484f-8ac8-f45e8c893618/90432810414.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/kasefiwaxexawazumixofiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59af2cc-f710-464d-8996-b58c91f7cea5/witozadumomegilotujaxal.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_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 5500 bytes
SHA-256: ac4ff8f6ae542699d2beb59ae43b8b62d9b65c8f429da4da101f9bdece02d429
font_01_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 10952 bytes
SHA-256: 6c0f6994930e860e669328e733e31820c0cc0dfbef27d37ba5f3d19914aede15

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