Malicious PDF — malware analysis report

Static analysis result for SHA-256 233607ff657ba259…

MALICIOUS

PDF

81.4 KB Created: 2021-04-14 04:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2d4088e1bfa52bdd8623f27c15da2796 SHA-1: 2480e8b1ed2a9773d41f67d82fc62d67c78ea23d SHA-256: 233607ff657ba259baf67733e44d3301d182f04483255dbe377b811e5c377e33
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('jottigo.ru') that is likely part of a phishing or scam campaign. The presence of many disposable hosting links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://jottigo.ru/strik?utm_term=how+to+use+koleston+perfect+as+a+toner PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373768/normal_6067a5c4f26af.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/rgdghij/xisujeromaxodal.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/4hegdjf/sufee_admin_school_and_coaching_management_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470837/normal_5ffc86f9d9f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_600dea9d9e293.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/hgkiaho/57554080392.pdfIn PDF document text
    • https://cdn.sqhk.co/neruxojus/jjgrXZE/photomath_calculator_app.pdfIn PDF document text
    • http://fijazubelanulek.mywebcommunity.org/rbl_bank_credit_card_application_form.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/tebuxoju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481993/normal_5fe44d02edf18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_60156b10e65f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406216/normal_5fcc1ab6e0483.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/MgeQkjN/lego_hidden_side_fire_truck_boss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novogizeboje.myartsonline.com/how_to_attach_leg_pulley_to_total_gym_fit.pdfIn PDF document text
    • http://tuwofexuguxu.epizy.com/62544586584.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/28593324385.pdfIn PDF document text
    • http://guwuwusiva.rf.gd/food_canning_process.pdfIn PDF document text
    • http://jipuzekas.rf.gd/46558297370.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_21d0f841357b4a2b9026c4a1d8602b7e.pdf?index=trueIn PDF document text
    • http://togevutifakumag.rf.gd/42128154599.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_76666f30bcd447c290f7939269b34e84.pdf?index=trueIn PDF document text
    • http://ladibemotivusam.epizy.com/how_to_read_data_from_another_workbook_in_excel_vba.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_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 5124 bytes
SHA-256: 52cb21c59a94ff3b9d3bb928a66825e4142e0c00def09084a5fa10c34711650d
font_01_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 11352 bytes
SHA-256: 7575ae8be1405924c2528aa305fb50d35b6a3590010f0ae22fd3aa544b54dde5

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