Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58ce6e8c6830462…

MALICIOUS

PDF

74.2 KB Created: 2021-03-08 04:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fcfa6cb7a9e0f8b02ccf02cd8a6659a9 SHA-1: 4ac51e03bd8d31be718b151c4c30c3ff2096dbf6 SHA-256: c58ce6e8c68304629e88058af88f6ebedfa58c662d166f339a2b8d99d46d9ce7
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the document body, despite being heavily obfuscated, suggest an attempt to redirect users to potentially malicious sites. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/aws?utm_term=how+long+does+a+letter+of+recommendation+take+to+write PDF link annotation
    • http://forexgeeks.net/23382208672ev4fi.pdfIn PDF document text
    • http://stroymarketmetal.ru/innova_scanner_3100je81rp.pdfIn PDF document text
    • http://drawer.icu/vegan_ice_cream_vancouver_wa048r2.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/cjghieK/mighty_final_fight_apk_free_download.pdfIn PDF document text
    • http://veronaital.space/android_crack_market._apkukdy4.pdfIn PDF document text
    • http://50offshop.info/supesolodonogemoo30tr.pdfIn PDF document text
    • http://marafonsport.site/lovalefawomepuzibufafurygko.pdfIn PDF document text
    • http://yandex-delivery.cc/numbers_words_worksheets_grade_3976rh.pdfIn PDF document text
    • http://megatorg.ru/free_wood_sup_plansfav24.pdfIn PDF document text
    • http://vovality.club/vortech_mp10_wet_side_disassemblykzvp8.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/51ebdc8ce.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/j5gfiig/lipoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/ijdHEib/forest_rescue_2_apk.pdfIn PDF document text
    • http://makamar.xyz/nafegalojulamosotdf29y.pdfIn PDF document text
    • http://bestsaleshopin.xyz/2005_chrysler_pt_cruiser_service_manualmefn8.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/eWCZ1fA/skyscraper_demi_lovato_lyrics_spanish.pdfIn PDF document text
    • https://nilanifaken.weebly.com/uploads/1/3/4/7/134702232/23cf0fa8749.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/943816e61.pdfIn PDF document text
    • http://acupofjacob.com/the_monkees_im_a_believer_shrek8vkdx.pdfIn PDF document text
    • http://hookup681.site/aptitude_test_question_paper0mnl7.pdfIn PDF document text
    • http://casser.xyz/874906074213cl6i.pdfIn PDF document text
    • http://italiabeach.space/pdf_watermark_macrol0lir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 5456 bytes
SHA-256: bf631a255e0e3b8980bc90637af8eeb715d16f382b54ae4ba8a0496444d71ab9
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 10124 bytes
SHA-256: 38e2e15bb516339f215430631f755ad6af4c916d3508ab9ae143304ebbf1a2dd

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