Malicious PDF — malware analysis report

Static analysis result for SHA-256 1059af2deaca38e9…

MALICIOUS

PDF

75.7 KB Created: 2021-03-27 10:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b3d284673680b4c3ad4ec46818cee17f SHA-1: 5529968f01fed5d22d03e4b3eb67c6b1005f19fc SHA-256: 1059af2deaca38e92d3fe364dcbc7c7f6a3ae0430e5c585fadcfb3b97c37f11a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

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 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://soxebez.ru/award?keyword=attestation+d+accueil+algerie+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370768/normal_5fe190ddc482f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492580/normal_603cff9a874a9.pdfIn PDF document text
    • http://lamisorosasam.mywebcommunity.org/alphabet_militaire_otan.pdfIn PDF document text
    • http://morasuxod.getenjoyment.net/81225403066.pdfIn PDF document text
    • https://robubafo.weebly.com/uploads/1/3/4/5/134588337/tefagelekegev_bajikolon_wazed_bewokuxorob.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/game_of_thrones_season_2_episode_10_plot_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_6040294d9ce8d.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/6274387.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/85621095218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453108/normal_603e688a90eb4.pdfIn PDF document text
    • https://kibidabusiben.weebly.com/uploads/1/3/1/0/131070702/114059.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/kametavar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bubewap.rf.gd/ocr_biology_a_level_specification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/957bfef8-9ae4-4983-a3ef-4af3289045ee/apollo_twin_x_quad_review.pdfIn PDF document text
    • http://fufuzadawefor.onlinewebshop.net/sbi_online_banking_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8374ad3f-187b-4c83-a2d5-5d0d80100e00/grade_5_mathematics_printable_worksheets.pdfIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_dcf61568d3ca4323bc348d803f645b0b.pdf?index=trueIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_40cc8bb34a6c47379b2557fa9d9c79b9.pdf?index=trueIn PDF document text
    • http://litegizixusiw.rf.gd/networks_manifest_destiny_worksheet_answers.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_5ba682b85f15467395aae579058d8373.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_64d41b12f30e480da12206e579384a58.pdf?index=trueIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_71a09378f39f42cab35b1df0fc5c4ec4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e514de3-b0c4-4677-9c37-c7a50343f601/what_is_warren_buffetts_net_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce030fc-85b9-43e1-b0e5-605212f2b775/florida_pe_exam_dates.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_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 5312 bytes
SHA-256: b38a459c555e787c4df3441e7febf87d7c7700661c049b260679eec091dcd30e
font_01_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 11972 bytes
SHA-256: 7b2785c1dd814911058a38d13cefb5b251783e076b874f96600c19e52b45eea8