Malicious PDF — malware analysis report

Static analysis result for SHA-256 9977433b081cb56d…

MALICIOUS

PDF

74.5 KB Created: 2021-02-17 05:39:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ef2082b6a835f0af982d043e71143173 SHA-1: dfa1105f4f74813731c53bce6fa0da4846d8d587 SHA-256: 9977433b081cb56db4d7b60ca8a267f90a2dc6b27e56d2b495a06e73efc7384e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, indicating a link farm or phishing attempt. The presence of external URIs and embedded URLs suggests the document's primary purpose is to redirect users to potentially malicious websites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, suggesting it might be a generated PDF.

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://baarspo.ru/strik?utm_term=where+is+the+overlook+hotel+from+the+shining PDF link annotation
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/xigunamu_gimowutub_fojawig.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/mhbpahc/9123724168.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/jikovi.pdfIn PDF document text
    • https://torejijifixoni.weebly.com/uploads/1/3/5/3/135335296/e6d8da44b7d44df.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvukidovime/izfhgij/moniti.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/O1ipjaJ/ice_cream_cone_cake_design.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/gcAhcha/color_splash_pool_light_controller.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/xebuvuwov/3215710209.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/37676079850.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/moving_company_business_plan_template.pdfIn PDF document text
    • http://sijugisuvaf.epizy.com/fejeganatira.pdfIn PDF document text
    • http://masusekokuberex.rf.gd/arcsight_siem_interview_questions_and_answers.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_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 5108 bytes
SHA-256: d1a2cf2be621949c019bcd2f4a6db9641d08fd262585b8a74de87d5fdeff2fa3
font_01_sfnt_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 11128 bytes
SHA-256: a30a53e46382b86b4d3f1792557f18c6879ad9f80e1b38dd040a55b0fca95345

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