Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6a2961a25c6b64…

MALICIOUS

PDF

75.6 KB Created: 2021-03-20 11:03:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0754b14a2839800041e8965467029378 SHA-1: 234da9035cfc95e4bebf39efd71d5279b7b44700 SHA-256: 6b6a2961a25c6b64a3d8fac9da546ac3bbb6e238d489991c00e379335068560e
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, including one pointing to 'botokaw.ru', suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a link farm used to obscure the final malicious destination.

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://botokaw.ru/strik?utm_term=software+architecture+design+patterns+c%2523 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5fe634432ccd2.pdfIn PDF document text
    • http://nekalakizifefe.22web.org/behringer_xenyx_802_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411500/normal_5fec15df6fa0c.pdfIn PDF document text
    • https://cdn.sqhk.co/kedetofido/Z5Xiijc/fuferoremenipagexiv.pdfIn PDF document text
    • http://topcreditscore.info/470361817753i9ty.pdfIn PDF document text
    • http://auth02mobility.com/speak_out_intermediate_teacher_s_book_answersps3ht.pdfIn PDF document text
    • http://busurman.space/baal_veer_4258b2ep.pdfIn PDF document text
    • http://armlur.space/how_to_fix_google_maps_on_iphone_6t2s7w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zorogeloma.epizy.com/metric_unit_conversion_mass_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1073d6f5-0074-40d3-89b1-b8a5d11daf0f/30779393548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5527116b-c216-4ece-add3-2e2d98253b9a/ariens_st824_carburetor_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690a7104-950a-40ab-a285-fd70ce926bf9/how_to_solve_enthalpy_change_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/988c0193-ede1-4b50-aa1d-a08c5f55d301/aviation_weather_forecast_alaska.pdfIn PDF document text
    • http://serefelotu.epizy.com/wodiganogewosapapota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2716b3-82fe-48ca-94d6-4e217182b8ce/is_season_4_of_sword_art_online_out.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/wovunom.pdfIn PDF document text
    • http://nozulabagewena.epizy.com/19323372439.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/princess_diaries_11_royal_wedding.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_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 5580 bytes
SHA-256: ecf4dc0831619cefe363e41fb8a36cccde310a5605697f77e9d5c82e59d7f125
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 11408 bytes
SHA-256: e6fa34fcc464e89bf04e8d3aa537e29d408b95232fb3ea6b5919d2ecd13dfcb4

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