Malicious PDF — malware analysis report

Static analysis result for SHA-256 f545e8080a1b8d94…

MALICIOUS

PDF

73.4 KB Created: 2021-06-11 02:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9706ddbb4b4bae5cb7f0028d9e751d94 SHA-1: ecc986026e9d68a11291d8acece6dee581b7b7b4 SHA-256: f545e8080a1b8d94926558826b952274305baaf87660de382588a8eebd011474
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting services, suggesting it functions as a link farm to distribute further malicious content or phishing lures. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this assessment, indicating a tactic to obscure the true destination or host a large number of lures.

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://wastran.ru/pbw?utm_term=photo+grid+app+for+pc PDF link annotation
    • https://vurabagugodemox.weebly.com/uploads/1/3/1/1/131164039/joganetu_nuxaxodo_jetujabuwime.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374859/normal_5fc59b8c7634f.pdfIn PDF document text
    • https://kepigepejabuji.weebly.com/uploads/1/3/4/3/134315220/bce96618e9f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477369/normal_5fe83a4b70174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_60312793e2797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449422/normal_5fc9e4c952d8f.pdfIn PDF document text
    • https://bakukumi.weebly.com/uploads/1/3/4/4/134437371/8512449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_605f7d3c3672f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_602e5d4424d9c.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/folom_xapekalivima_vobemalatarux_gakajus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481286/normal_5ffcc9b80b9da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xeninexiruvo.pbworks.com/w/file/fetch/144891441/pafepugoxenojona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3fa0d12-7335-419a-958f-e51645f5d4d6/89191853340.pdfIn PDF document text
    • http://wepadigisita.pbworks.com/f/gta_v_5_ppsspp_file_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3356729c-6a9d-4f43-90b7-6954701dcdb6/why_is_my_controller_flashing_white_xbox.pdfIn PDF document text
    • http://lowigamivux.pbworks.com/w/file/fetch/145081356/vmrs_codes_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/557f7b4a-ccc2-489a-b47a-5bfd53e2a292/1402803243.pdfIn PDF document text
    • http://tinigogazos.pbworks.com/f/french_indefinite_articles_exercises.pdfIn PDF document text
    • http://sowenux.pbworks.com/f/zewalosajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd85e23-b741-44df-abee-85f8ee0b74ee/78040360232.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144452007/85521155111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d38fc44-def5-4abc-933d-12b96c3603c7/how_to_plant_vidalia_onion_sets.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_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 5208 bytes
SHA-256: 79992472b2c80965d453469c35769efbc9092fc091097f2132d3d00eaabb523d
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 10460 bytes
SHA-256: d85355e2c83237ed0c3a3a879dcf6adad17bbbef278a8639c1e95b7c0fcfdc1b