Malicious PDF — malware analysis report

Static analysis result for SHA-256 a024ca5b3f2dc9af…

MALICIOUS

PDF

81.5 KB Created: 2021-05-03 14:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1bd8d241d0fc2f1511573c5827c1c6a1 SHA-1: d7bebd8357e27ad42d7a2bdf826374714cb752f0 SHA-256: a024ca5b3f2dc9af0089797b59fc5ce072a2a4854e42b9abeeae644dd61f6adf
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://gimoguvi.ru/strik?utm_term=setina+installation+instructions PDF link annotation
    • http://wosozage.mypressonline.com/afrocentrism_theory.pdfIn PDF document text
    • http://vamekujo.66ghz.com/blank_2018_september_calendar.pdfIn PDF document text
    • http://mofolaz.22web.org/how_to_adjust_crotch_buckle_on_evenflo_car_seat.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/canada_express_entry_points_calculator_2020.pdfIn PDF document text
    • http://vedivux.mygamesonline.org/adobe_reader.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/adobe_edge_animate_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_081039d2e1ce46efa60401a960579566.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/rigelamirovof.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_4c6c11f918dc42ff81c8cb0ab3ef11b9.pdf?index=trueIn PDF document text
    • http://rojepubaxogo.epizy.com/usc_math_placement_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/96173634321.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/bhagavad_gita_tamil_audio_book_free_download.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_15d8931298fc474299c9cc94554b8514.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vunizi/sullivan_precalculus_online_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/norelco_9000_series_replacement_blades.pdfIn PDF document text
    • http://rivetibixonapaz.myartsonline.com/17274318182.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/zaturusalaxifemifat.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/36293343067.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_493fd14975ef4c5dad4d433399557cb1.pdf?index=trueIn PDF document text
    • http://foxebunuref.epizy.com/fungsi_answer_back_system_scoopy.pdfIn PDF document text
    • http://zemodofu.epizy.com/how_to_put_together_a_conair_razor.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011ddb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11DDB 17464 bytes
SHA-256: e4076e9ac3e53eba724d247cad50814d8f301c0d66a7edb61655847d061e3259
font_00_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 4896 bytes
SHA-256: 03317af1abf03ea873e029160a8e28c2f8c640cde746f77aa99dda1ab747b0c6
font_01_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 10476 bytes
SHA-256: e72e462694246eb9eeb5f303e399475e23af0b40d6bd614014d8df3c964712c0

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