Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c615d7e0de24d5…

MALICIOUS

PDF

66.0 KB Created: 2021-03-28 04:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 419e2ca9dc216adb40eebb8c15d2b4a9 SHA-1: 627c70e48f0645e5f36610548fbc7f4ff2d7ef2c SHA-256: f1c615d7e0de24d519e6d233cbe19f52a267f10929538153dc3c2f4b2b23637a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=secondary+math+2+module+6+6.1+answers
    • http://zuwifipenabed.medianewsonline.com/modern_world_history_b_v_rao.pdf
    • https://dajadigab.weebly.com/uploads/1/3/2/7/132712332/1555572.pdf
    • https://zerexiborugixa.weebly.com/uploads/1/3/4/7/134705556/tiloxubupu.pdf
    • http://lawexape.mygamesonline.org/what_are_the_basic_macrame_knots.pdf
    • https://ruvatekokero.weebly.com/uploads/1/3/1/4/131437102/5062721.pdf
    • http://nubilofanekib.mygamesonline.org/arduino_coding_language.pdf
    • http://bilet-pdd.site/dinixureboutimd.pdf
    • http://2gusevshop.space/welding_multiple_choice_questions_and_answers_download74xwl.pdf
    • https://mimewizade.weebly.com/uploads/1/3/4/6/134678746/3417096c983.pdf
    • http://wijuviniwak.iblogger.org/carlos_alberto_brilhante_ustra.pdf
    • http://glawerry.online/goxubebezokuxisidogeleboy5wfs.pdf
    • http://garantiya62.ru/what_netflix_is_me_before_you_onrwrrc.pdf
    • http://gemofesane.medianewsonline.com/what_is_required_to_become_a_public_relations_manager.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_0fb41c3e461549d6b44db2e0c1a3a973.pdf?index=true
    • http://linakagiwabofa.epizy.com/country_heights_holdings_berhad_annual_report_2016.pdf
    • http://zivexotafoni.myartsonline.com/carnival_of_venice_trumpet.pdf
    • http://mifotabelimudon.myartsonline.com/jukimivokamotidokurik.pdf
    • http://vokifanebol.rf.gd/digidesign_digi_002_rack_audio_interface.pdf
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_8e95e3b0c7424e5db9e4b914899347a8.pdf?index=true
    • http://nozulabagewena.epizy.com/magoosh_toefl_practice_test.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c78e.bin
fda5a0cab02f689a9a5afcdadd47ca92fa6be36ba265ab4faa81c8e62d0f4a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC78E 5848 bytes
font_01_sfnt_off0000db6b.bin
e38e0ea1014990521cd0dd8ed449c092515079f1cdf4bc7fecc5ca1baf86f287		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 9524 bytes

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