Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b0a6e5f8bf1634…

MALICIOUS

PDF

75.6 KB Created: 2021-06-08 11:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3726d8abe80223ebfc2d14d7a7b48d9e SHA-1: c98376b2069a8338b1a08a88ee0aee2367d876c7 SHA-256: b9b0a6e5f8bf16343d6a388e6ba3bf477856135bd8088e1d9aeff17b512ae0fb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, with one prominent URL pointing to 'ketchas.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a quiz. No scripts were extracted, but the presence of multiple disposable hosting links and a link farm heuristic indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/pbw?utm_term=touching+spirit+bear+figurative+language+quiz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368489/normal_606c6d737d991.pdfIn PDF document text
    • https://devonejejarib.weebly.com/uploads/1/3/4/6/134608322/kaxixonavarus.pdfIn PDF document text
    • https://nasijominazol.weebly.com/uploads/1/3/4/3/134366940/rezak.pdfIn PDF document text
    • https://mifanupomiseri.weebly.com/uploads/1/3/2/6/132681757/5609313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_5fd829f9cb022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_6003a82d15100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_6066296de9ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417045/normal_6049332710e79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zolunegoli.pbworks.com/f/86966165843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9f2f8e-e992-4a61-9d1c-a6d48b180e84/social_media_marketing_strategy_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ee88a1-e248-444e-8907-a865afbf1209/what_happens_if_i_get_a_fake_check.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/nonton_streaming_fast_and_furious_9_sub_indonesia.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144553686/97420418677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e320fc3-253b-4ebb-ab8b-083fdb9a4bf1/medamer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd6d64b-2652-48ab-b1d3-7e31d1648e88/high_definition_audio_bus_driver_windows_10_64_bit_amd.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144508071/95623164709.pdfIn PDF document text
    • http://kelivesas.pbworks.com/w/file/fetch/144667254/25708900309.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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 5600 bytes
SHA-256: 20f73703f5aa122e8b6aef7ccb914c78441f1fd844bcd507b1333148f8c9bbc2
font_01_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 10568 bytes
SHA-256: 9bd18869f28eb95b50394ac0f9e23fda62724106de92649ef6341d8737fff3fd

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