Malicious PDF — malware analysis report

Static analysis result for SHA-256 145f539dc32f4c5c…

MALICIOUS

PDF

74.4 KB Created: 2021-02-27 09:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0001ca0bef5bb2b441de36d467f40e00 SHA-1: 3bf540591eeed466ae9582b0da1813282c1c96c9 SHA-256: 145f539dc32f4c5c85274954ddae1c7c8436171955a7d3893790a6df7d99b87d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The document body, though heavily obfuscated, contains text that appears to be a lure related to architectural rulers, which is then linked to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=how+to+read+a+architect+ruler+1%252F8 PDF link annotation
    • http://apeech.ru/95006434796xydh2.pdfIn PDF document text
    • http://sallles.ru/84318596046n2ugs.pdfIn PDF document text
    • http://slimerecipe.org/delhi_satta_desawar_aaj_ki_reportvlbu7.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/68007723285.pdfIn PDF document text
    • https://lisevududotuwak.weebly.com/uploads/1/3/4/2/134265384/fuderulev-lodav.pdfIn PDF document text
    • http://chatik85939775.fun/23936130557yx9mz.pdfIn PDF document text
    • http://funseeds.site/matlab_plot3_axis_limitskto97.pdfIn PDF document text
    • https://dawopodesolapip.weebly.com/uploads/1/3/5/3/135327749/rusegu-nikuzemukejo.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/mens_air_force_1_low_white_size_9.5.pdfIn PDF document text
    • http://thecet.xyz/tftp_server_for_windowsczetg.pdfIn PDF document text
    • https://namikefazexu.weebly.com/uploads/1/3/1/6/131606603/vapatuguw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tasefabomodewiv.epizy.com/gosedojitekalobekekimis.pdfIn PDF document text
    • http://bameromaxaw.epizy.com/cronica_de_una_muerte_anunciada_pelicula_critica.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/lijexujo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 5184 bytes
SHA-256: 9e97c38bc38d44a0c676e35d7e22e8623300c0438907f80475adf9a933749411
font_01_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 14836 bytes
SHA-256: e64525782209ac5f3c1dbe4548622e02ba9e7c4bb5e1989a99c2bfabbb0ac11d

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