Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7412dafc3f9105f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 15:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98e113df7a434c0fc8519e0a4e0e0fd1 SHA-1: 5c735410191662213334878ea56929dfccdde955 SHA-256: b7412dafc3f9105fcacadd91f13fe019c65a9e87432c5f7133861cd9e918cbc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, one of which is hosted on potentially disposable infrastructure. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://immobilieninvestors.de/userfiles/file/66953867624.pdf In PDF document text
    • http://luligang.com/ckfinder/userfiles/files/94914995266.pdfIn PDF document text
    • http://letdentalab.com/img/files/nanuwuturemigovejebelukep.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/16813490126.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/24668698638.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/82208286516.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/zarexawagizopamiwawulobi.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/jusijomalaniroxuxewetu.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/liwusuju.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/wujiwevorojepomajed.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/52867993720.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/33564119389.pdfIn PDF document text
    • http://artepcb.com/upload/files/90545868755.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/37498525280.pdfIn PDF document text
    • http://www.moyekolodin.com/files/64622461097.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/bitujoj.pdfIn PDF document text
    • http://proxima-design.cz/files/file/77898651407.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/zunusezeduwekin.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/73339486329.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/76407604877.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/18026921272.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/zurejenekanone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=principles+of+instrumental+analysis+solutionPDF link annotation
    • 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_off0000c10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 17884 bytes
SHA-256: 97ba1be05dd1ee0e61087d903dd33b43930a1ae9a043e7cfa0f8de5bcf78a949
font_02_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 10856 bytes
SHA-256: e199f7b9a8523c190d3ab3e5835ed789ff7e145e59ddf7982d9f26d8d720991e

Open this report in the interactive analyzer, or submit your own file for analysis.