Malicious PDF — malware analysis report

Static analysis result for SHA-256 68399679f98bbf51…

MALICIOUS

PDF

84.8 KB Created: 2021-02-25 21:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e7cf5fd177eba06e14be67e8e6414d2e SHA-1: 96a7902ff61cb1b30f6252d0e206fadd94296062 SHA-256: 68399679f98bbf51a4d4e88e55887221ed5be020d60fa910658cb28a1462bad8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though partially corrupted, contains metadata and keywords that may have been used to disguise the malicious intent.

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://maypoin.ru/award?keyword=workouts+to+prepare+for+marines+boot+camp PDF link annotation
    • http://jigunemav.22web.org/vebev.pdfIn PDF document text
    • http://afracheat7.xyz/exercices_adjectifs_possessifs_fle_a1k30f6.pdfIn PDF document text
    • http://nepifenimet.iblogger.org/integrated_reporting_acca_p4.pdfIn PDF document text
    • http://reduslim-siteofficial.site/ludo_star_2017_apk_download_for_pcdtykr.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/what_anime_is_one_punch_man_from.pdfIn PDF document text
    • http://alcexpress1.xyz/37930002684n1fzf.pdfIn PDF document text
    • http://macsk.space/candy_crush_saga_hack_cheats_generatorr35jb.pdfIn PDF document text
    • http://fruitik.space/xipatiramf8c1.pdfIn PDF document text
    • http://yachts-4-sale.com/geology_notesb2t94.pdfIn PDF document text
    • http://nexefugo.iblogger.org/hoover_carpet_cleaner_model_fh50150_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_6023888b1edb5.pdfIn PDF document text
    • http://sun-italy.space/writing_and_solving_linear_equations_worksheetdevqx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://torexogisodejez.epizy.com/meteo_casinalbo_di_formigine.pdfIn PDF document text
    • http://rofogaxadu.epizy.com/tomazefowajolefelik.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/ielts_writing_answer_sheet_2020.pdfIn PDF document text
    • http://sebuvikibafil.epizy.com/great_wall_of_china_movie.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/77849683002.pdfIn PDF document text
    • http://gewofudi.rf.gd/codigo_binario_definicion_informatica.pdfIn PDF document text
    • http://dajivetu.rf.gd/arabic_worksheets_for_kg2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 5228 bytes
SHA-256: 55041684e4b56c788918b8310f6753657b509f7d4bc38aeb68b13abfaaf98945
font_01_sfnt_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 10644 bytes
SHA-256: 91efb4d1c441cd147b7b969da3a6d73f290feaf57d03b30aba75aaefd473c034
font_02_sfnt_off00013747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13747 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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