Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b160b53444026a…

MALICIOUS

PDF

65.3 KB Created: 2021-09-27 07:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 15e82028c0ebd93d8ce8caff6c53b546 SHA-1: 4627148264bb1986f4111b68b06d19fe4996b4f1 SHA-256: f8b160b53444026ab8faa82288eee05e88f0396ad121b23e8acbe15a27c09efb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=newness+2017+watch+online PDF link annotation
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/34372560582.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/paxojido.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/45948962529.pdfIn PDF document text
    • http://abnicum.com/files/file/18719018687.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/7860844343.pdfIn PDF document text
    • http://hkacca.com/userfiles/lefefoniwekajapevonobe.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/winulotokuxevigak.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/kalamazobamibizop.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/24495093888.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/vezenipunufujefunadimivul.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/logorapigurevakugo.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/tivuvuzevadezazaritupivet.pdfIn PDF document text
    • https://12shio1.com/contents/files/vusiru.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000baba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABA 14764 bytes
SHA-256: cd95ad8636998c1e64f361c6be83fcc3d7d02287d4c866851df76edbd416355a
font_02_sfnt_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 10636 bytes
SHA-256: 8fe29e9d961737e071674f266c3f6d7e0bb5339869c823473ad1c46a480bc209

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