Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f8e1adc28fee7f…

MALICIOUS

PDF

65.4 KB Created: 2021-03-16 16:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 932903ea807840aeee5f139029fd83bb SHA-1: 30fbbdd0e7cc51808e0a667a9e8cc34a9e1fe761 SHA-256: 95f8e1adc28fee7fcd7d5fe27cfd976f4b3f743e836878edf2c0fe2fadfbaa57
184 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8273

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
  • 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
  • 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://ponafet.ru/award?keyword=excel+advanced+skills+writing+workbook+year+4+pdf
    • http://ruwosiju.getenjoyment.net/adolescent_health_care_a_practical_guide_5th_edition.pdf
    • http://letabumo.getenjoyment.net/numbers_100_to_1000_in_english_exercises.pdf
    • http://memowelubi.mygamesonline.org/encyclopedia_britannica_vk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wuxupewu/48115458778.pdf
    • http://jigiwema.epizy.com/xeziferomisotifibofi.pdf
    • https://uploads.strikinglycdn.com/files/606df704-fb75-4ec4-8944-52d041cad25f/how_to_connect_playstation_gold_headset.pdf
    • https://uploads.strikinglycdn.com/files/05b179bf-7b37-4a44-95c5-d8c3cc6bb095/harga_mixer_yamaha_16_ch.pdf
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_98ab6e151c474bcfaece08dddf8b88b6.pdf?index=true
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_59966d6bdc8c4cf3835d163ad1888cb3.pdf?index=true
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_bd2fb7edb51e4030b79817938ef96170.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cd7a8e3d-dad9-433a-97cc-ba5c171f254e/how_to_increase_speed_on_gas_club_car_precedent.pdf
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_5808ebe31c0b42e7881527a97c188416.pdf?index=true
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_7c913dcbcbdd40b9a27059b47b1c6caa.pdf?index=true
    • http://rojexar.rf.gd/xorekikukazin.pdf
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_646b2cac8ec54a2fbc40310f77537b0b.pdf?index=true
    • https://s3.amazonaws.com/tadevewuju/adtran_modem_manual.pdf
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_6ad585fab0e645af93e8a5629842b478.pdf?index=true
    • http://nupuzasig.epizy.com/basement_car_park_design_guide.pdf
    • https://s3.amazonaws.com/dazemi/baskerville_old_face_font_bold_free.pdf
    • https://uploads.strikinglycdn.com/files/c08a37c3-47db-46a6-8d63-be1b3eeec56b/sap_gui_for_mac_free_download.pdf
    • https://s3.amazonaws.com/xovekolamoxe/orari_poste_campoformido.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54c.bin
75183a58496b15edb04b9054460a641f26d6e499efc6d03df13f489d75523ad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 5896 bytes

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