Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2363413683a19dc…

MALICIOUS

PDF

80.2 KB Created: 2021-03-22 00:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 86222a24f6f1dbb88e5f4533b4462c7a SHA-1: ef03b4499e05d73d98c96e23769db6a2fc3522ae SHA-256: a2363413683a19dc7c8a8ed4079be2b5bdaa24b1fb089c69cea35a34c6b3433c
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. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the malicious intent through a large number of links. While no scripts were explicitly extracted, the nature of the embedded links and the ML detection strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=doom+3+resurrection+of+evil+boss+guide PDF link annotation
    • https://wuzikixow.weebly.com/uploads/1/3/0/7/130775075/legivigujisum_sigobexasutitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403274/normal_6004573228e73.pdfIn PDF document text
    • http://xokodiraki.22web.org/scales_and_arpeggios_aristocats_sheet_music.pdfIn PDF document text
    • https://gunisuzafi.weebly.com/uploads/1/3/4/3/134311694/4469383.pdfIn PDF document text
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/5e06b.pdfIn PDF document text
    • https://vebuwume.weebly.com/uploads/1/3/5/3/135349689/7805566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495849/normal_5fcd73a9377ee.pdfIn PDF document text
    • http://mivarajemaze.22web.org/42988432735.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/the_ancient_secret_of_the_flower_of_life_summary.pdfIn PDF document text
    • https://nixalimug.weebly.com/uploads/1/3/2/6/132680811/wobixedotusijix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juludiripo.myartsonline.com/how_to_set_up_intermatic_wall_timer_tn311.pdfIn PDF document text
    • http://wokoguzesel.rf.gd/centroid_acorn_user_manual.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/english_language_hd_video_songs.pdfIn PDF document text
    • http://ramawotinejog.epizy.com/flame_test_lab_analysis_questions_answers.pdfIn PDF document text
    • http://bosirizowu.rf.gd/wejob.pdfIn PDF document text
    • http://jozizirepimetel.rf.gd/gugorazosik.pdfIn PDF document text
    • http://fekugijofexoz.epizy.com/autocad_save_black_and_white.pdfIn PDF document text
    • http://giwinilugo.epizy.com/ejercicios_clases_de_sustantivos_5_primaria.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_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 5492 bytes
SHA-256: 28fd67bdc5549386b1810666adc8ca70088cd6e9db1e6a0374d6588fb66c6d94
font_01_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 11148 bytes
SHA-256: b2ba778f84a05f6cdb01cd01349c48cdcb3fa1e58128e3cb1ae0b0f231055d35

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