Malicious PDF — malware analysis report

Static analysis result for SHA-256 6632b8f69c4abf3d…

MALICIOUS

PDF

89.1 KB Created: 2021-05-19 07:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 56174f611f01554a316c97d199652575 SHA-1: 877c7b89d8826015c85f1766955e5aec8f1f7b8a SHA-256: 6632b8f69c4abf3d0a9cd87d5f5631300d91ae04828bd8c5845c8b5fd5c2658e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/strik?utm_term=valores+comerciales+de+capacitores+electrol%25C3%25ADticos+pdf PDF link annotation
    • http://fegalaro.iblogger.org/cumulative_frequency_graph_worksheet.pdfIn PDF document text
    • http://tozufokoxogo.22web.org/free_book_report_template_for_elementary_students.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/899fd620dfa2c.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/guxikaju.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/389286.pdfIn PDF document text
    • https://fewidatemuvej.weebly.com/uploads/1/3/4/2/134266352/romonezobasaweti.pdfIn PDF document text
    • https://kijabejinal.weebly.com/uploads/1/3/0/9/130969506/ruvujowamexebuwut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nadalapaxizo.epizy.com/18134283086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6bf052d-5675-4708-8548-7887912c5065/washington_dc_weather_10_day_hourly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3a0325-4c8b-4912-ba19-92b5b7854b79/34210234537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc060df-33d1-4e6f-9376-5b0947cf3d96/61237359705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2babb897-ac65-4c7f-b79c-51f61c037b5c/10833227888.pdfIn PDF document text
    • http://vomozenofeke.epizy.com/wurabemot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/566d106a-9a6a-4b68-acba-da503969e623/ge_spectra_xl44_gas_oven_manual.pdfIn PDF document text
    • http://zisifotixevul.rf.gd/how_do_i_reset_my_american_megatrends_bios.pdfIn PDF document text
    • http://wemikovovafebo.epizy.com/36162376545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b38b66e-f979-4635-90b2-e722e0226dd8/how_to_write_a_5_paragraph_essay_outline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0362902-a8b1-4936-825a-9b7067639d64/ropesijevofirowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8108d612-d723-4d67-81ab-dc17d79480eb/big_green_egg_table_hole_size.pdfIn PDF document text
    • http://jilabof.epizy.com/2018_subaru_forester_2.5_i_premium_all_weather_package.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/docket_sheet_lookup_pa.pdfIn PDF document text
    • http://gewevamaki.epizy.com/50319945970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96956e15-8bdf-4fc9-b393-656030fca3f3/how_to_reset_epson_printer_to_default_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/alien_movie_android_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6cd8b2f-219b-457c-88e8-ee80aae0fba1/46204299120.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/ru_application_form_2019.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_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 5320 bytes
SHA-256: 217cc27ba0f94a82c301d183b7f1c073a21d25dbc7fcd92a11e63db38d100979
font_01_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 12180 bytes
SHA-256: 3a2bceb21b84926186189fab7b0df8ab99832a7d07cffe6a50d4d8242eed47cc