Malicious PDF — malware analysis report

Static analysis result for SHA-256 91723a594f457242…

MALICIOUS

PDF

76.6 KB Created: 2021-06-10 23:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8c6d0ef7923fb364ca04245fe598a5ad SHA-1: 19d03857b4cecd78b55efa4629ea037ca5c42f92 SHA-256: 91723a594f4572429e047a244f39d247b5409d9f6f0d74dbf68ccc516870dd31
134 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. It uses an urgency-based lure. 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 0.9956

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/pbw?utm_term=tristan+new+girl PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375698/normal_5fc666fa311c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485004/normal_60399561ccde7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454280/normal_601d198551348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakesobiroge.pbworks.com/f/ms_office_2007_tutorial_in_hindi.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144619422/how_to_make_graph_in_excel_sheet.pdfIn PDF document text
    • http://nefusim.pbworks.com/w/file/fetch/144625710/wikovikalexu.pdfIn PDF document text
    • http://nawujewo.pbworks.com/w/file/fetch/144984213/lyrics_of_love_you_forever_by_tasha_cobbs.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/23105276369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b467f8-d956-4c2f-9d99-7c91aebc7213/dell_optiplex_gx620_sff_power_supply.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144421554/37887566855.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/barebazixifurosatexidubo.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/how_to_open_xlsb_file_in_android.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144485391/king_gizzard_and_the_lizard_wizard_tour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7158767f-7099-47c5-ab28-82b6a272a54e/asm_psycho_test_book_in_hindi.pdfIn PDF document text
    • http://wirajudukim.pbworks.com/f/what_does_blue_tick_mean_on_instagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5034068-f83c-47b0-a7c5-2022de2c62f4/vexakosizifemarojiluxowol.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144764934/gufozoxezud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342ef8b7-d7c9-4f1b-9d6e-ad4a350e7ca8/how_to_charge_pocket_juice_4000mah.pdfIn PDF document text
    • http://fagimox.pbworks.com/f/rusodim.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/zodig.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144573291/zisugoxufiwaxetoxomarik.pdfIn PDF document text
    • http://werinenimuta.pbworks.com/w/file/fetch/144525057/how_many_types_of_routing_protocols.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/w/file/fetch/144985149/cbse_class_6_english_grammar_worksheets_with_answers.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/how_can_i_apply_for_inter_caste_marriage_benefits_in_karnataka.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/tibalal.pdfIn PDF document text
    • http://rivikixizub.pbworks.com/w/file/fetch/144979407/kuami_eugene_ghana_we_dey.pdfIn PDF document text
    • http://papedisuk.pbworks.com/w/file/fetch/145060158/52884655041.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_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 4896 bytes
SHA-256: 23076d58b4451816d9ae5f7b1acada8274b052fa1a3b58745aa434207233fffa
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 10696 bytes
SHA-256: c24a9d6555d1cbb770b7cfc9c75c398d86557dab352021e9adca8f9e593c61aa