Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f60c0a62b8619bf…

MALICIOUS

PDF

91.4 KB Created: 2021-03-24 23:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 108a0088964f79078913709f6ed5d92b SHA-1: 569c8e5a5f04858736bcba6e8fbe5b2a7cee21c2 SHA-256: 3f60c0a62b8619bfc7258600011a956e4eff08857de2d22b8bd1ec0654d46bc9
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support 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 0.9989

Heuristics 7

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://mezovuduw.ru/strik?utm_term=after+we+collided+book+story PDF link annotation
    • http://sakuravaju.iblogger.org/cdr_file_convert_to_online.pdfIn PDF document text
    • http://chisto-chisto52.ru/58725481522xq9c6.pdfIn PDF document text
    • http://vobugefu.22web.org/wanotitirukezerivex.pdfIn PDF document text
    • http://azakalaza5.xyz/teamviewer_for_remote_control_uptodown_downloadgy0w9.pdfIn PDF document text
    • http://pewagupudasita.22web.org/39973624637.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3e4358-86c9-4fe0-8897-a82bd9b22896/81776116926.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_5e2fd82d3c05483fa5cf23bf0517cfbf.pdf?index=trueIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_4fed76ddb811463c9add1ff9c02de25a.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_9b8add5d49c3421397ba5eae2469a60b.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_eca3723dcdb74a55a7562b23119ceb8d.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_1b7bf61c1b19422a951fdd1340d4b183.pdf?index=trueIn PDF document text
    • http://xarozimazog.rf.gd/43639886459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34885adc-564a-4abc-9c2a-df6878f2ff6d/98519382534.pdfIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_b4ab7677c3304c2fb2caa5f179637d6e.pdf?index=trueIn PDF document text
    • http://roxoretubobo.rf.gd/reading_comprehension_book_intermediate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55524a22-6c59-444f-9c4f-3ceb844f07f3/does_cashing_a_check_show_up_on_statement.pdfIn PDF document text
    • https://8459f3b7-b2e6-4b58-af31-5f29adf293b7.filesusr.com/ugd/a68450_ddc3207c316140f8a4a51fa6aab7629a.pdf?index=trueIn PDF document text
    • http://zugopenuk.epizy.com/vocabulary_for_ielts_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3ae7b1-46f7-4cbc-a6e8-605af167b254/peterbilt_diesel_technician_salary.pdfIn PDF document text
    • http://diwomikutaz.epizy.com/zeboberuweres.pdfIn PDF document text
    • http://vijoputu.rf.gd/belimefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e7defd-48d7-4abd-b09d-82d744ef6236/marurasixojeneguf.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_aa327485399a4903b3ebef58d5d3afec.pdf?index=trueIn PDF document text
    • http://dojidusajotat.epizy.com/lilly_singh_bawse_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 5192 bytes
SHA-256: 41cb8b4fe602fce2fc85b1e9b637ec53e0c674e055d18a3f92aa28187873d150
font_01_sfnt_off00012c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 1884 bytes
SHA-256: b45c62d5613ddef6e7e0f70851ad0cdbca2410a55d14d40e71b7f596dccccee6
font_02_sfnt_off0001354c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354C 12372 bytes
SHA-256: f235ceaa27243434402d8f76dfb8843435bf83a154cdbb097e0806894e1b8f0e