Malicious PDF — malware analysis report

Static analysis result for SHA-256 253c40b7e70b547d…

MALICIOUS

PDF

80.6 KB Created: 2021-04-27 06:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 630560696756f91be398f9fe4b2f1495 SHA-1: ff3892d480925c99a3656e148ccc0d076002f349 SHA-256: 253c40b7e70b547db45f4d11d8c6ad1ce4459c22863a03a59923ea730c3441a4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=stihl+bg+56+best+price PDF link annotation
    • https://jezipupokegem.weebly.com/uploads/1/3/4/0/134042816/8096364.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/tipos_de_investigacion_de_mercados_cualitativa.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/effective_communication_in_workplace.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_60219241e4aa7.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/tratamiento_nutricional_para_cancer_de_colon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496577/normal_606e558e572d2.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/5490563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_5fd39ab3e3bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_60668f5f25ecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_60391f131b113.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/lemefazamofugodi.pdfIn PDF document text
    • https://rumunalitivera.weebly.com/uploads/1/3/4/0/134041361/gekifibux_ruwixetoxoxatep_pavopovuker.pdfIn PDF document text
    • http://suwufexez.sportsontheweb.net/arduino_8x8_led_matrix_max7219_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5adc70ce-91c4-4c4d-847d-00da284006ca/what_are_the_5_major_biomes.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/vobajogipovotijul.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/55575153921.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/vikakawanejedawiguji.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/25305000101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87990c74-aa83-41e6-a34c-a1606ecd4590/bissell_proheat_pet_carpet_cleaner_no_suction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf3dbc5-b56b-451a-9999-0ea1265257b8/miluzegex.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/32480167067.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_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 5508 bytes
SHA-256: 1b569667d1cbc29db218da7c91d63633d9eea004bf4c41471069221d2e8a1ae9
font_01_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 11532 bytes
SHA-256: 69e5185a014a79ec2a73c3351868215ba40685979e29fae8129b273fd6efe381

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