Malicious PDF — malware analysis report

Static analysis result for SHA-256 b551adbe6ce0b0f2…

MALICIOUS

PDF

73.7 KB Created: 2021-03-28 12:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7b9f347df06c5ccf449f4d4f06db97ab SHA-1: 23616106b56ec536b3e8c108f1f5be1a3240669f SHA-256: b551adbe6ce0b0f2dc31cca1eab017178a98e8636c805f13ea0ba0e8ef1b3a34
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 host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document is a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/award?keyword=ccnp+notes+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/sebutarukaw/jgcmjdY/84821170088.pdfIn PDF document text
    • http://veletekuti.66ghz.com/the_giver_chapters_1-_5_quiz.pdfIn PDF document text
    • http://kemotunitajifap.iblogger.org/66711891006.pdfIn PDF document text
    • http://numusuri.22web.org/pitching_in_business.pdfIn PDF document text
    • https://cdn.sqhk.co/sinupupuzaxa/2gfjcia/78791185519.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/3d89c394-62eb-4f1e-811c-197b5826223c/draw_with_jazza_creating_characters.pdfIn PDF document text
    • http://bepinutarefe.rf.gd/mikejigupanu.pdfIn PDF document text
    • http://wajiletum.epizy.com/former_ceo_of_popeyes.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/80491878097.pdfIn PDF document text
    • http://gezuvemun.rf.gd/casio_scientific_calculator_fx-_570w_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f26241-49ee-497d-a1d5-738838357087/pepevaloxe.pdfIn PDF document text
    • http://gesovupa.epizy.com/what_to_put_for_race_if_black.pdfIn PDF document text
    • http://zepalosolup.epizy.com/dictionary_of_publishing_and_printing.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/64388502688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ca835b-40d2-46c4-8557-b25d3fbf42e1/suvifenonomexekem.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/moxagarobilotefozajufa.pdfIn PDF document text
    • http://jerasopel.epizy.com/how_to_put_mp3_on_iphone_without_computer.pdfIn PDF document text
    • http://zitovidenelanus.rf.gd/57201223920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de39459-8e99-4bc9-b695-58691caa04e8/93420159630.pdfIn PDF document text
    • http://pipumatatipubu.rf.gd/tesubepavirozixatikudo.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/nogojozokikaler.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_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 5148 bytes
SHA-256: 99783bca63c8ae3c224f65cd474eefa25e26bbaa4c89bcd256998ce2a04a2715
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 11188 bytes
SHA-256: 13dfed5c5458a11024fcdc4f661acb3e6339a82aabab1234e9b45a7f29ad2bdc

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