Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bac03108c3a6dc5…

MALICIOUS

PDF

85.6 KB Created: 2021-02-24 23:21:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a4ca7a56b936b91d999cc37457b1b569 SHA-1: 98bcfb109b0b1ef1cc72a6fafa44689074e3eeaf SHA-256: 7bac03108c3a6dc549b4e793856d93427fb504e203b68051cae4cbd91aac5789
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 SEO-optimized and point to other PDF documents, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for phishing or further malware delivery.

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://jottigo.ru/award?keyword=dirt+devil+lithium+cordless+3-in-1+16v+stick+vacuum PDF link annotation
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/4792303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fd660c10650f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_5fe7cb7637f23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494677/normal_6003c2a53bde5.pdfIn PDF document text
    • https://mubonunegaj.weebly.com/uploads/1/3/0/8/130874179/b4a9216d5b6f76a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473403/normal_5ffbfedc83c29.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzezajolu/hehdcjc/zadosad.pdfIn PDF document text
    • https://cdn.sqhk.co/foxezevewa/icNhhii/party_city_locations_melrose_park.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503050/normal_600f87bdde463.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/yg15jcM/police_department_administrative_assistant_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/fqDgdge/code_compiler_programming.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376598/normal_602a4646ac82f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_6033a11d5f58e.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/genedesowul/adventurers_league_season_9_player_s_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/toxufiwaz.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/standard_thickness_of_steel_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/1790776719.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/modern_calligraphy_book.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_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 5704 bytes
SHA-256: db56ea498517362106cd00ad87346092ad926c273612a3b1622e5f83517c4d02
font_01_sfnt_off000124a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 10704 bytes
SHA-256: 4f9bcf5bcf2b7429dc45465c070eddb7745b4b9cbc43b47a91e96b8fe94fc192

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