Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cebea95cfe35ee1…

MALICIOUS

PDF

79.1 KB Created: 2021-04-03 15:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87cf25aefd4f32b44e3594e6c3f53345 SHA-1: 29ce443584bd2299abd03d9d9dcb74bd565f3838 SHA-256: 8cebea95cfe35ee1c9322e810196cf489b17667aefcb52b7afd1daff1a4742da
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating it is part of a link farm designed to drive traffic to various websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no explicit scripts were found, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

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://kuzutuzo.ru/aws?utm_term=what+is+general+merchandise+store+meaning
    • http://lunatan.medianewsonline.com/functional_analysis_psychology_example.pdf
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/gudojibavobub_digadiza_jezusegisogutim.pdf
    • http://naxuvazexipok.sportsontheweb.net/mimegawos.pdf
    • http://instgramcopyrightdispute.com/anodyne_shoes_return_form4d5nd.pdf
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/1301967.pdf
    • http://pikegupima.medianewsonline.com/carcinogenesis_process.pdf
    • http://cafechorsu.ru/nukuf94ccn.pdf
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/lazakine-tejuziwuzos-donizafokad-viwopi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7d211ab2-fd2e-4a4f-a156-0493e88ed6bf/ti_nspire_cas_vs_cx.pdf
    • http://xufoziminep.onlinewebshop.net/jumowe.pdf
    • https://uploads.strikinglycdn.com/files/8eedeaa9-61ec-49f4-b3e1-c2fd620905ce/desarrolla_una_mente_prodigiosa_gratis.pdf
    • https://uploads.strikinglycdn.com/files/b3aad809-17df-4487-9211-257a296c74de/wifafesemolofalebo.pdf
    • https://s3.amazonaws.com/pegek/8464002891.pdf
    • https://uploads.strikinglycdn.com/files/504179d1-72b5-49f2-8302-a412ed34c5dd/20577361098.pdf
    • https://uploads.strikinglycdn.com/files/ccb3536f-29a3-4e29-ba81-1d9eff4a1820/31857959937.pdf
    • https://s3.amazonaws.com/kubafezin/capsys_informatikai_kft.pdf
    • https://uploads.strikinglycdn.com/files/ee0bef57-dc07-45ea-a206-bdbe8068e6c7/ronijakowizowisosurinedo.pdf
    • https://uploads.strikinglycdn.com/files/04036772-b7a8-482f-bb77-7944752181f3/webinar_autocad_civil_3d_training.pdf
    • https://s3.amazonaws.com/woneketelak/phonics_worksheets_double_consonants.pdf
    • https://s3.amazonaws.com/rebomedug/how_to_wind_a_bobbin_on_a_singer_tradition_sewing_machine.pdf
    • https://s3.amazonaws.com/sagotomagin/87854154283.pdf
    • 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_off0000f886.bin
426f91276bb4faaf9c523fffffb4c82f9a2b447453ecfdaf04f5b7f5265ac1f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 5364 bytes
font_01_sfnt_off00010aa2.bin
f3e9f4e670ef55de460b65c198a2b82c8e7d88e3dabef9051443b9b30b01b7d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 10692 bytes

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