Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f4b1e64de715bb…

MALICIOUS

PDF

79.8 KB Created: 2021-04-06 12:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a378836c7ee7bc6dd082e48f8695d62d SHA-1: c2b03fe58fb7863cfdeb8501c1e3dcdcec2b53e6 SHA-256: 35f4b1e64de715bb343cc325a808e3c1758745edabe00d01add5651a3efa3e2b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to disposable domains and one specifically using a UTM parameter that suggests a phishing or malicious redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

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://xezojetit.ru/strik?utm_term=the+fall+guy+truck PDF link annotation
    • http://islemleriniz.org/wards_signature_sewing_machine_uht_j276dxf1is.pdfIn PDF document text
    • http://fuxuderumonif.22web.org/49142083825.pdfIn PDF document text
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/1397521.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/cooler_master_storm_stryker_dimensions.pdfIn PDF document text
    • http://mybestchan.online/duranibiganowavibojudezuwhl3qp.pdfIn PDF document text
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/waxebabikof_rorojexi_tenivutubuvunan.pdfIn PDF document text
    • http://mugipojezekegul.iblogger.org/24379595287.pdfIn PDF document text
    • http://poradoit2.site/bolanebifasdwejj.pdfIn PDF document text
    • https://teraxawazolazov.weebly.com/uploads/1/3/4/3/134386914/83dd4d.pdfIn PDF document text
    • http://xevijuwidenuxet.mypressonline.com/la_belle_au_bois_dormant_perrault.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/jenisozazewubo/tijakosufa.pdfIn PDF document text
    • http://xijuwevame.epizy.com/proper_and_improper_fractions_worksheet_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/english_grammar_in_tamil_free_download.pdfIn PDF document text
    • http://dogurof.epizy.com/liquor_store_business_plan_example.pdfIn PDF document text
    • http://bupalim.atwebpages.com/arduino_beginner.pdfIn PDF document text
    • http://mologesasik.epizy.com/2348043314.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_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 5080 bytes
SHA-256: 159d9723c4ed3d7fd3a118fb0feb59d943b3bdf489a5ad1abf8c1000d7e85df1
font_01_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 10640 bytes
SHA-256: 0233db3da951831d767881c49334c4ad372f0929fc76bd9330a5bc87831d502d

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