Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e22be22ad33c57…

MALICIOUS

PDF

71.5 KB Created: 2021-02-07 20:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0c75ecd8cc684b077d748e3346fd0770 SHA-1: 77a964cbbfcfd5eacb4957ee02bc3e31682a4f80 SHA-256: c3e22be22ad33c57d6322cbfb5745d67b018bd153922b770ec2010e69c5d8879
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a link farm with numerous external PDF links, including one to 'seumenha.ru' which appears to be related to search keywords. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious or phishing content, likely as part of a spearphishing campaign.

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://seumenha.ru/wb?keyword=kumho%20tires%20review%20consumer%20reports PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496816/normal_5feb0535257bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fe01a8bef15e.pdfIn PDF document text
    • https://tidatulo.weebly.com/uploads/1/3/2/8/132815220/a1ebae5ab94ded.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447251/normal_5fe4060410d64.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/131a92472.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408865/normal_5fcf9be8383bc.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/jevivuzijofege-meweniram.pdfIn PDF document text
    • http://merishwheelrecords.com/97331609430tpx4q.pdfIn PDF document text
    • http://masajsalonunuz.com/synonyms_and_antonyms_worksheets_for_11_plusxf22z.pdfIn PDF document text
    • http://my-favshopg.online/microbios_y_enfermedades_ruy_perez_tamayow1g89.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/lijulijowivaze/91331793118.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/fairytale_of_new_york_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/leave_application_form_format_for_employee.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/32350551728.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/bat_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/play_store_app_please.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/bms_recorder_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/bleep_out_sound_effect.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/90748155238.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_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 5052 bytes
SHA-256: 7d253fb7b3173608ec887a33b4869e2cec26619169ac374cc8215d5d0a251d65
font_01_sfnt_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 10916 bytes
SHA-256: a241778f830f5d9596a4e41eed095f9da0ddfc72635b697ac1e5e5a908d55783

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