Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4c49bdd2809451…

MALICIOUS

PDF

81.6 KB Created: 2021-03-31 11:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e24aa40589241d9f775cafe5089f317a SHA-1: 5bc80cf979b257a680c43529c6544f7a2e3ab3ce SHA-256: ef4c49bdd28094514c7ba5e149c6293e0057ded43d71b82fc1ffebfb3a48bf61
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the overall structure point towards an attempt to distribute further malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/award?keyword=business+case+study+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/nawamuzimosu/pSAmBfk/fiwilowopezetu.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/Cgjn3hi/endless_run_lost_oz_game_download_apk.pdfIn PDF document text
    • https://zurobalunaxul.weebly.com/uploads/1/3/2/7/132712088/951d72d1d01de.pdfIn PDF document text
    • https://jakikoxu.weebly.com/uploads/1/3/1/4/131411542/2e9f61.pdfIn PDF document text
    • https://cdn.sqhk.co/dikonutudibe/gc9jcie/90596364237.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/bgc2vhi/35402771771.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/jshb2hh/61215120249.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/91d04c909.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/vigcMje/63242284156.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/iBh9hXX/pathogen_examples_in_animals.pdfIn PDF document text
    • https://fewibiwovenekip.weebly.com/uploads/1/3/5/3/135327418/tolorobufez.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/sihhjij/82030733091.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/nefomojuwet/32815307504.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/les_miserables_abridged_sparknotes.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_1f0a16c370fa45e4b71d0c1096b2f424.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b543fd-ccb8-4ca5-8a65-8fc8b206cd3c/lewis_dot_structures_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0f77cd-0a46-487f-a578-be47d554a1ee/jufuxagatire.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_04166383bef140439c012437a7157154.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_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 5392 bytes
SHA-256: 6128c9b86bc86235eaea9c2a8299f580a37347269d4f3ce41b4c000e298602d5
font_01_sfnt_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 10768 bytes
SHA-256: af19d15e514dace144f6b5c4bafafc4dc94c93f77e5ec8da42462b55e57569c8

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