Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e88ccf329c29479…

MALICIOUS

PDF

83.5 KB Created: 2021-03-22 10:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 255cc883e851b325e130fd9e110c59d1 SHA-1: 215cbe1cf3969a388c6926254a90d5f9fd35695c SHA-256: 3e88ccf329c29479485a078a2623bd5ffb95d628fb91c18739c60181252cc5e6
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://ponafet.ru/123?utm_term=aubrey+qwana+uhamba+nobani PDF link annotation
    • https://cdn.sqhk.co/ketalidukepi/jmgjiaW/cs_driving_student_portal.pdfIn PDF document text
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/6dc6e7a019b4a7.pdfIn PDF document text
    • https://povebosi.weebly.com/uploads/1/3/5/3/135346093/kobupixe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375351/normal_5fdee21952921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_60571bdf3b76a.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/oFhgwlo/75327404528.pdfIn PDF document text
    • http://faketikus.22web.org/swimsuits_for_all_return_form.pdfIn PDF document text
    • https://cdn.sqhk.co/vakusukereju/EefhaTg/90407300892.pdfIn PDF document text
    • https://xolovimuwoza.weebly.com/uploads/1/3/4/8/134865524/9251963.pdfIn PDF document text
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/97b5e57de3d8.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/ghgfvcY/91867240391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e0e72b86-dda9-494d-9270-70715eac7a4b/lisemuwufemilizasovat.pdfIn PDF document text
    • http://buguwinul.rf.gd/44953671167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6971c8a4-05f1-49b3-abe2-f8b1894e8a2c/how_much_does_it_cost_to_replace_a_power_steering_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddaa417c-2c1d-4e46-8815-5d800fbbaba6/how_to_sync_qcy_earbuds.pdfIn PDF document text
    • http://sezaluri.rf.gd/function_of_liver_in_digestive_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/355d26e4-bceb-407b-b0a1-60b2433b74b9/kejep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1862422c-d7be-42fb-8411-d79fc62d221a/virizorikubupevife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481eb6ce-01c9-4daa-9bdc-e6164cd8ca8b/kilusowusedifimagaxevute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b8efdf-afb5-4614-befc-21001cd5c3cd/descargar_tubidy_mp3_gratis_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20466981-23c5-4629-9de1-a82a1974e698/how_to_connect_my_canon_printer_to_wifi_ts3122.pdfIn PDF document text
    • http://besikinugid.epizy.com/boss_me_80_manual_mode.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_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 4968 bytes
SHA-256: 77acd104c65b42c615cc3074101f03d3993943768ed67c228eb4585c1cc6df7c
font_01_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 23680 bytes
SHA-256: d6ca6a4169aab81b8ae0840912dcc188fa376f4186ccb4dd478d19291baaddc1
font_02_sfnt_off000130db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2