Malicious PDF — malware analysis report

Static analysis result for SHA-256 80713837486b27a4…

MALICIOUS

PDF

74.6 KB Created: 2021-03-18 09:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e8b8e82736b624a537a631a01e83176c SHA-1: 56b5b863dbda90f8f3b3aee37b7ed3747e076c44 SHA-256: 80713837486b27a4a95e4cdb7aec144a308320658fdf106dee6a7ec053aef02e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the nature of the URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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 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://midufefew.ru/wix?keyword=coin+master+mod+apk+march+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425912/normal_600ce49acbae5.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/6672998.pdfIn PDF document text
    • http://lifeshop.pro/gcse_chemistry_balancing_equations_questions_and_answers7lqi0.pdfIn PDF document text
    • http://xploitcrew.io/meyerhof_g._1956._penetration_tests_and_bearing_capacity_of_cohesionless_soilsaq5mu.pdfIn PDF document text
    • http://wersita.space/6769215885119b51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379837/normal_5fdf10d3d9ea2.pdfIn PDF document text
    • http://bioforcecolumbia.site/28447764191e5jdo.pdfIn PDF document text
    • http://wordsideget.top/jubuvuzivejerunerakuxagevbi58s.pdfIn PDF document text
    • https://lemusovigezamo.weebly.com/uploads/1/3/1/3/131381045/1a7b6.pdfIn PDF document text
    • http://bluebadgeapproval.com/9663926069stbvw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_60345d177bd00.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/depudo.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/wemofodi/mackie_micro_series_1202-vlz_review.pdfIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_9b519d9a5ce84653ade860d4fd997fff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/how_much_oil_does_a_2015_ford_fiesta_take.pdfIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_4cc2880d1ea741069ee756b57a2ee1b5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 5524 bytes
SHA-256: 78c30afebe9a2eed01c2c393df2d1f27ef58bb6d780b187113b8f509e9b60dcb
font_01_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 10916 bytes
SHA-256: 172a62681682edac0887b4300bc318536f93e83aaedea1c09738c4c9e2d3d3ee

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