Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a936317726d0c2…

MALICIOUS

PDF

74.8 KB Created: 2021-04-07 19:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 04ce724837a6150e4176d2a13e567406 SHA-1: e6fafc54a8bd20578dd803553bf9b47f6455b932 SHA-256: 88a936317726d0c27cb1d01165d22b4d29b785a7f332a1cc11ad9eddfe1a669b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://resalured.ru/strik?utm_term=chamberlain+universal+remote+reset PDF link annotation
    • https://wadodimimilupe.weebly.com/uploads/1/3/0/8/130873890/vokerajote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459916/normal_605bee8b13d2d.pdfIn PDF document text
    • http://lienforkid.com/mtg_first_strike_deathtouch_rules45yza.pdfIn PDF document text
    • http://atomlinux.com/tom_sawyer_study_guide_questions_bydytin.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/h5iisgd/67692052232.pdfIn PDF document text
    • http://leoidet.xyz/rejepozexefenadirufazi0l0q9.pdfIn PDF document text
    • https://xonadenot.weebly.com/uploads/1/3/4/6/134685596/8842933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383699/normal_5ffe069fd86ae.pdfIn PDF document text
    • http://xumekiviwuvumet.22web.org/biology_investigatory_projects_for_class_12_download.pdfIn PDF document text
    • http://belldiscount.ru/segavupagozalipokolajilw8qhw.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/aQJggja/9770524992.pdfIn PDF document text
    • https://pupotebomur.weebly.com/uploads/1/3/4/7/134707076/kivikaxujesenizemo.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/lulepomabepipemikifovub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450434/normal_605c06d6d2c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474446/normal_6041634b5ea48.pdfIn PDF document text
    • http://vapusokupasaz.iblogger.org/santee_diversion_canal_fishing_report.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/ewigdjg/saxekaveminerafafewawumar.pdfIn PDF document text
    • http://sis-paypal.com/enlace_ionico_ejemplos_resueltos37hub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371261/normal_5fcb0f3d21de1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_0e1fdf7fd1d6430c944c12ded9e96725.pdf?index=trueIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_98d3d28f6a1b4dddb5737e35bafbd0b6.pdf?index=trueIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_5092a04547374e55b4451ca13b4cd82a.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_ea946e39710e45eea56111f75b294f6e.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_e7d6485a9bcc4579bb89a88450a9d726.pdf?index=trueIn 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_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 5028 bytes
SHA-256: 175973303673346855574c37a88ef043aec9741883718ed9b974e8faa47a8c1d
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 10616 bytes
SHA-256: ec87ee79e9313b8173b14c413e440a43a707db8e48287f0ec83d28dfa79e4019