Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f58de3cc7b93c74…

MALICIOUS

PDF

73.1 KB Created: 2021-04-08 12:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: be2f92e718f125bd689de86618f36e4d SHA-1: eca01895b701d9a09258d93156b0620bd4e7945a SHA-256: 8f58de3cc7b93c744cdd28975dca712aed4fdcb75ccab4e55d4229e138e6cd71
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 0.9991

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 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://midufefew.ru/strik?utm_term=is+my+carrier+furnace+under+warranty PDF link annotation
    • http://naxiramomamaz.66ghz.com/black_red_wallpaper_hd.pdfIn PDF document text
    • http://jabofuzo.22web.org/puxesuvowakezulonixit.pdfIn PDF document text
    • https://dezilupogebog.weebly.com/uploads/1/3/4/1/134109094/duwumiwesap.pdfIn PDF document text
    • https://wadabugijiri.weebly.com/uploads/1/3/0/8/130873870/jegag_tuvukisida_vagewukijoj.pdfIn PDF document text
    • http://gometug.22web.org/lista_de_verbos_uniformes_biformes_e_triformes.pdfIn PDF document text
    • https://jedogivezuse.weebly.com/uploads/1/3/4/8/134862252/govenusamosiwogilatu.pdfIn PDF document text
    • http://wuvudazesog.22web.org/49085179424.pdfIn PDF document text
    • https://sutovuwoti.weebly.com/uploads/1/3/0/9/130968995/juxigopenariwiru.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/af3e7fd69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixupod.rf.gd/36514254242.pdfIn PDF document text
    • http://wezekopufoj.rf.gd/mental_ability_test_questions_with_answers_for_class_8.pdfIn PDF document text
    • http://xusijaxux.rf.gd/dopeguwavijitu.pdfIn PDF document text
    • http://mexefesu.epizy.com/sagidowakezirijewalodadav.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/polako.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/anuncios_facebook_formatos.pdfIn PDF document text
    • http://vegizutix.rf.gd/astronomy_today_8th_edition_chapter_3.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/lorina_epic_seven_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/38837196790.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/digitech_jamman_stereo_manuale_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/dstv_tv_guide_compact_plus.pdfIn PDF document text
    • http://kumugirenukelil.epizy.com/15483947865.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/what_to_eat_on_a_keto_diet_plan_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/how_to_fix_shaking_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/picard_damage_report_meme.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 5264 bytes
SHA-256: b927c7b4a59f2d1316b49ddec8ae64e8136e714482e3f3a676fc7ee83af319fe
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 10428 bytes
SHA-256: 519f2e026dc92319319c4c467496f888e7abd4b3bc4274f80690fd9deb3cfc35

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