Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c11615036e16aca…

MALICIOUS

PDF

76.7 KB Created: 2021-03-17 19:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bc3065478326f975a415b55c336b220 SHA-1: 1e33577b067ef7aee088efb5ee206cc60d7ea16c SHA-256: 7c11615036e16aca281cf8a9de908383194f065bc4ac35c490ecfda8f7e1b9fa
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic firing for a 'PDF link farm' pointing to multiple suspicious URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites like http://psychologyrelax.xyz/linda_goodman_sun_signs9s4sy.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=john+deere+430+60+mower+deck+belt+diagram
    • http://psychologyrelax.xyz/linda_goodman_sun_signs9s4sy.pdf
    • http://servempieza.site/bekogfojru.pdf
    • http://spindlndou.space/29072952629udwrr.pdf
    • http://zimezobot.getenjoyment.net/asset_classes.pdf
    • http://xepuxupipe.mywebcommunity.org/business_plan_format_sinhala.pdf
    • http://sexedate69.site/favogukisa24y0p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ab91d022-a194-4522-baf7-3bb34337156e/sefamobezo.pdf
    • https://uploads.strikinglycdn.com/files/f88b5959-170c-4b07-b939-137be270bf65/qual_o_melhor_horrio_para_tomar_sol.pdf
    • https://uploads.strikinglycdn.com/files/a4918ba5-9246-4c2b-92df-58eb2f3ce2cc/what_are_viruses_worksheet.pdf
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_b2b628d9197647fbb76ef5f443865b29.pdf?index=true
    • http://gipebevu.atwebpages.com/how_do_you_critically_analyse_a_journal_article.pdf
    • http://wonanikapudidak.atwebpages.com/salirigap.pdf
    • https://s3.amazonaws.com/mavixu/gdp_calculation_questions_and_answers.pdf
    • https://s3.amazonaws.com/dazifozixawus/zigupurosanibamekod.pdf
    • https://uploads.strikinglycdn.com/files/f74dd965-b7d1-4842-9a20-e162d73112b2/2004_g35_transmission_fluid_check.pdf
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_48f2a7fd07bd45c09cacd2ad05babbfe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/84c758be-f28d-47b9-af5b-56540bfb0f56/buwatafekera.pdf
    • https://uploads.strikinglycdn.com/files/4eb3af2d-8b31-402e-999a-770f435116a9/29467742208.pdf
    • https://s3.amazonaws.com/kigavanus/jiboxepogeregexibanuxetud.pdf
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_bb1af2c5a170461d84ff1a08020ef434.pdf?index=true
    • https://7920a853-f458-4dfc-a893-f50c3ed6f780.filesusr.com/ugd/fe7850_50f7a42c07174d5fadccf0ff49fce80b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb94.bin
103b3924d7cf9bc7e1542e8248695ec5614bc0482137a8037a851197a738c3aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 6008 bytes
font_01_sfnt_off0000ffef.bin
b8362890b4abde3010fc65ad507544bb30a66074677289b1e3ec5b3ca341faa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 11272 bytes

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