Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b56b6c1de55d6f…

MALICIOUS

PDF

79.1 KB Created: 2021-03-21 03:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cd7eb3746b15e840226ff3e6d1e891bc SHA-1: 53b9e4b28bce5f73df49ebd162ae87cad8467b29 SHA-256: 93b56b6c1de55d6fbe8c487be0957e06191d25c46d4f235387fca70db368f126
126 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable hosting domains, suggesting a phishing or link-farming scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dugedepap.ru/wix?keyword=hill+climb+racing+2+vehicle+guide PDF link annotation
    • http://trychambre.xyz/msi_z97_gaming_5_m.2_support2oibh.pdfIn PDF document text
    • http://pofubodegi.iblogger.org/2006_honda_civic_ex_sedan_front_bumper.pdfIn PDF document text
    • http://wirelessinfo.ru/agricultural_tax_exemption_form_michigangbrk9.pdfIn PDF document text
    • http://wajulosuju.22web.org/77259002222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5ffe25a61119e.pdfIn PDF document text
    • http://salufogi.iblogger.org/galvanized_steel_sheet_properties.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444370/normal_602a2859d2f17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5fd083d9091b6.pdfIn PDF document text
    • http://labincom-med.ru/student_attendance_management_system_html_templateksi0q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_6027c795ef871.pdfIn PDF document text
    • http://esclub.info/the_chronicles_of_narnia_prince_caspian_full_movie_online_in_hindiigqsf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475580/normal_600d0e356f0c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pafemovokixap.rf.gd/disap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1bb20fe-5454-436d-a16f-d1e449d85809/ncert_math_book_class_8.pdfIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_a140a80eb6444779a9aaa3c3bcad887c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisedij/12979717145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c37d1468-7f1b-4466-805e-cf602b1b708c/how_to_sketch_derivative_graph_from_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4f15de-d5a7-42c9-ae80-b7d4c0fc1fe2/gatijifegavove.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/bootstrap_responsive_portfolio_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0f8e50-fa18-4d8d-98e8-876c47c9d455/cuisinart_digital_convection_toaster_oven_costco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d190ae95-5535-4534-a6aa-f6fa89c71ffd/american_buffalo_gold_coin_1_oz.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_fc62b0d4dd1a4ccbb4f3057fb67c62b1.pdf?index=trueIn PDF document text
    • https://d0570615-6cc6-4b78-9a9c-590639bc525b.filesusr.com/ugd/30850e_a8bc0aed44c9444c92f5de961dba7e3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/14383200259.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_9416f8631bbb414f86fecdea1d39ebb4.pdf?index=trueIn PDF document text
    • http://fapibudu.epizy.com/93623562693.pdfIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_fe08a0e7e3d247ae97d0c5d8ce13cbbe.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_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 5468 bytes
SHA-256: ab4d8c25a4e963664f47cccf1ff26480530ebe339c0bf79fee03c2d8b58cfb9b
font_01_sfnt_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 10848 bytes
SHA-256: 41002ff53bc941171ba1e8b572d03448a9447a88fc0fdab84ef53a7b044f458f