Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4833d759dd919ed…

MALICIOUS

PDF

102.1 KB Created: 2021-09-18 04:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 782f7bbcf0dd7b1e767341e3661bc183 SHA-1: 6261f152a48739880e0e637bba15473bc94bdc77 SHA-256: c4833d759dd919ede322e4c00bed17d3eae10977121d7ebd672b7349874811e8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious lure, likely intended to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/76750393198.pdf
    • http://vonschickenconcord.com/uploads/files/dopurigi.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/27996113329.pdf
    • https://nedimgame.com/calisma2/files/uploads/sozokerasa.pdf
    • http://homeopathyhk.com/files/31261453145.pdf
    • http://dermalab.pl/userfiles/file/92994400222.pdf
    • http://abwmechanicsville.com/uploads/files/xaloboba.pdf
    • http://wowbond.com/upload/Fckeditor/file/bebixo.pdf
    • https://bruceautoservice.com/files/file/pugemupejeselunufamo.pdf
    • http://cs-golfclub.com/ckupload/files/gofopuxerepizoja.pdf
    • http://zuche0551.com/upload/file/49030540396.pdf
    • http://retco.ge/ckfinder/userfiles/files/putuwuvilimazazunages.pdf
    • http://chonburi33.com/userfiles/file/wuwatubuvuzomujur.pdf
    • http://johnmarzillier.com/ckfinder/userfiles/files/jowaz.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/8474493.pdf
    • https://acryl-bg.com/userfiles/file/39801267254.pdf
    • http://homeopathyhongkong.org/files/pojixuxepewivugakorud.pdf
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/47591222290.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/82725416059.pdf
    • https://wodepcb.cn/uploadfiles/files/xaranagewimutunar.pdf
    • http://brandiassociati.it/userfiles/file/83479018992.pdf
    • https://sproname.com/files/userfiles/files/63740990628.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sketch+like+an+architect+advanced+techniques+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012435.bin
2751831d3d911bf511b09d34ec5379da6317a7c293558b2ef71830ca1caee46a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 20012 bytes
font_01_sfnt_off000158c1.bin
132e4dec5ca08fa5636b2c33293f8d71d5bd85fa4a2a8ea6237f8ef99d5bcd1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158C1 11076 bytes
font_02_sfnt_off0001724a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1724A 16792 bytes

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