Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a54a8d5cfb2336…

MALICIOUS

PDF

72.6 KB Created: 2021-04-04 15:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7ad1bdf059e7ef577a8ada4a04283a50 SHA-1: ec732053b2931e1d1f238182907a8b996c369b07 SHA-256: f7a54a8d5cfb2336c7c05b831f23e53489bd85518d715b034ede89ff41d8a8ea
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with several pointing to potentially malicious or unknown domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://kuzutuzo.ru/strik?utm_term=bose+av3-2-1ii+gsx+media+center PDF link annotation
    • http://benosetib.iblogger.org/illinois_durable_power_of_attorney_short_form.pdfIn PDF document text
    • http://subakegewoje.sportsontheweb.net/bankruptcy_act_b._e._2483.pdfIn PDF document text
    • http://tolofat.22web.org/company_profile_design_template_powerpoint.pdfIn PDF document text
    • http://zofoxexizoviro.iblogger.org/wizifilowikepelezu.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/lenenuxakerezuxuzi.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/natural_selection_peppered_moth_lab_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13dbc848-c95e-4197-a439-3ae2050b6ee2.filesusr.com/ugd/46bbe5_5ed87ccdc28c4e29bb91518632a86d8c.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_ec77a077b7c7401d8c46484bcbd0ff41.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_4b31274a80754d4ea8d53f2179dd19d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1821926c-2854-4b8d-aa10-aefb6aa607b6/myles_munroe_books_on_marriage.pdfIn PDF document text
    • http://lepugip.epizy.com/bubbly_bubbly_tamil_song_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8720d2-4cff-4d6f-9e04-3ae505859b05/padutudoxubarizagotil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5397362f-0037-43ea-85be-c364a389a4b7/27894969367.pdfIn PDF document text
    • http://tejademadubo.rf.gd/tibasokunukegikobebosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a08d05-91d3-4288-9898-6301b488ab26/how_to_put_vinyl_sticker_on_glass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a020f1cb-c58d-4c9b-985a-c6b44b29a1e4/62631902852.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_8e8af3b1be6847c091474109efbee1f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/659b2ed2-3c1f-4863-8770-923035a1bd5e/how_much_is_a_dapple_grey_horse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9594a433-eefe-4cfa-a240-02ee7bbe4363/what_makes_a_good_husband.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/23959223216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286ab03a-f0a7-4978-8adb-17cb00af9d45/how_do_sociologists_explain_deviance.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_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 5784 bytes
SHA-256: 34009ede48a6078b03e9ad1ec3794fc1dbb35b1f4702ee00b6c943fffbb2e657
font_01_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 10456 bytes
SHA-256: 2bb4865be5cd8d6cfdef70afa5708207e40bdf9e005193852642cac0c9edc1bd