Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c8e3f268621004…

MALICIOUS

PDF

69.6 KB Created: 2020-12-16 16:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ce0e9207d6180b024533551e4e671bd3 SHA-1: 9e9ca3ff57e0d0894feaf64a06f64d716da44ea1 SHA-256: 81c8e3f268621004315b1a5f74bb95312b0819357fa7c8bd2d5131b613a03baf
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple critical heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS, indicating malicious intent. It contains numerous embedded URLs, with one pointing to known malicious redirector infrastructure. The presence of a link farm suggests an attempt to manipulate search engine rankings or distribute malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=what+are+knowledge+intensive+firms In PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/turusizaxelabid.pdfIn PDF document text
    • https://bikewodeganesu.weebly.com/uploads/1/3/4/5/134596115/zadunob_juzowumax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_5fa7ac491fbcc.pdfIn PDF document text
    • https://debexubomes.weebly.com/uploads/1/3/4/8/134881130/ripozesewuxijex-wonad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1497f116eb00e3c4e9468/t/5fc737061d106d256bbeacfe/1606891272153/fixilimeperon.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6331e6d49a06bb89cef8/1606378293731/fidujaxupesijirafikax.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc72271418d7934ac756570/t/5fc78a039dfc2a404523066d/1606912515995/pisojiviwopuzibelexa.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/el_mejor_antivirus_para_android_sin_anuncios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83114dba-5afe-4ff3-a6de-7378afdfddc4/vigubetalurujuzubufirer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c215225-ea7a-43c9-a04c-3f88b52d3c4a/oraciones_subordinadas_adverbiales_p.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/cracked_antivirus_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/algebra_1_solving_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/amu_entrance_form_for_class_11_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/kokekivusevemogozanapela.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_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 5552 bytes
SHA-256: 7a0ceaa3922659db4a7228de3cb4a65ac2e20e57eeebd0c54fddaa59a70d4e09
font_01_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 12008 bytes
SHA-256: 2ec61b9c538d2b621f4382d0d45a2091770313399193be2949976f715f61de6d

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