Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae7ffb3e27648aa…

MALICIOUS

PDF

75.0 KB Created: 2021-03-21 21:37:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 54b38adf2d830d0d14cab5889ea5ec79 SHA-1: b18ce3c0c348b73c8a84a144581f0865b9538299 SHA-256: bae7ffb3e27648aa5da4587abd70aab79c6e8ddd4715fce0feb95b8e9add9629
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=beginner+drum+exercises+pdf PDF link annotation
    • https://cdn.sqhk.co/kawonidoza/ii2Fji0/13301542153.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/xrtihUt/57077660010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366033/normal_60085f6c67053.pdfIn PDF document text
    • https://radixukawatezod.weebly.com/uploads/1/3/4/6/134645496/5ade2671f9bf4d9.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/8uifkvb/mishary_alafasy_dua_mp3_free_download.pdfIn PDF document text
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/temekefo-rumesizabeli-zobamaxo-xejegu.pdfIn PDF document text
    • https://dojebuxepoviguf.weebly.com/uploads/1/3/1/4/131407435/941794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_60143ae848c1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_602e71dadebd6.pdfIn PDF document text
    • http://paselon.getenjoyment.net/the_miracle_morning_book_in_marathi_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/ajejjuN/country_music_artists_male_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/hmgiP9M/menopasuxeju.pdfIn PDF document text
    • https://budoxaku.weebly.com/uploads/1/3/0/8/130873914/de764.pdfIn PDF document text
    • http://wonozudobitisog.scienceontheweb.net/saluvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370074/normal_5fe0699c331a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_604d049aec03f.pdfIn PDF document text
    • https://nukarudurarera.weebly.com/uploads/1/3/1/3/131380042/4054764bc3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zebofazedixa.rf.gd/disney_tattoo_flash_sheets.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_4c9505bf23ab46a0a753a543d072347b.pdf?index=trueIn PDF document text
    • http://bibuxidon.rf.gd/icao_annex_13_10th_edition.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_546a3b8b4c5b4eee86e082564b0e467a.pdf?index=trueIn 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_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 5348 bytes
SHA-256: 2a06b7370036311a2159e65c8d6782753eebf862257cef15486c913ad9b4fe91
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 10260 bytes
SHA-256: 738cd0ced859a92ef8d65c2227fda372327a92f077ea9f81bb7b7db0235f2115