Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2d87b4f574ed19…

MALICIOUS

PDF

99.2 KB Created: 2021-03-09 01:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 496a51a1c2c6b489abfcff775317455b SHA-1: 2457e23e336e72cca492b707169189ec234f23dd SHA-256: 4b2d87b4f574ed194c36abe6c86f04442ddf1cfd3936f6c61d29893ee1f0fb02
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many links on disposable hosting to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/award?keyword=ayyappa+swamy+bajana+songs+tamil+pdf PDF link annotation
    • http://cosmicgig.com/731467724716cx8c.pdfIn PDF document text
    • http://wivafojoki.22web.org/archery_2_mod_apk.pdfIn PDF document text
    • http://tafelutij.22web.org/lemon_drizzle_cake_bbc_good_food_guide.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/fantastic_mr_fox_full_movie_in_hindi_free_download.pdfIn PDF document text
    • http://wwbook.org/48301754934ec71c.pdfIn PDF document text
    • http://cloudplay.xyz/js_games_code86mxs.pdfIn PDF document text
    • http://womizepivilora.sportsontheweb.net/refuw.pdfIn PDF document text
    • http://salufogi.iblogger.org/define_a_spreadsheet_application.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/1063903669.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/mpdf_page_break_inside_div.pdfIn PDF document text
    • http://nufapivevavenak.22web.org/68104310556.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44ef408-8901-4034-b0b3-50413e272b69/43287842654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f8af83-83a7-4602-845b-56f680d6e377/64087122532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f42bd8-3d07-4f2c-be08-f04036115753/crochet_patterns_ebook_free_download.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/tarubateworegab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b3c805-db17-4f63-bf09-c9d13b6f58d4/how_to_program_comcast_xr2_remote_to_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a78e07-c085-47c0-aad7-eb82171228e6/jane_austen_emma_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf1c25f-c7fe-4cc3-bac7-bd0e36eb9baa/devilbiss_air_compressor_pressure_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611576b9-f802-4ba7-9388-a59bcd47dd4d/which_states_have_safe_haven_baby_boxes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b65ca05c-bf7e-404f-aebe-5c4679994ebe/83752206281.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014841.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14841 3188 bytes
SHA-256: 78f2154d0a28724847c764d8bb84366750f4210fdb8117a0064070f4734c46d7
font_00_sfnt_off000134ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 5664 bytes
SHA-256: 7a0d26e94dcd065e74cd3d9c30ddb3caa1d343b384817837e38eecd137653e6b
font_02_sfnt_off000154ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154AC 13140 bytes
SHA-256: cc420087dce733df411cff7fb4467c1ac764c10e5e734562b230bd03715b3cef

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