Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f3354c56ebc721…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 22:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ce6ba4bff1a09d4725e9d977d607c79 SHA-1: 5c84931d55c0b1d4f6c07933f71160b7555ae016 SHA-256: 59f3354c56ebc721f24973d72558d87888e516454d211494cb4f49195997da33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://cructi.ru/uplcv?utm_term=business+report+example PDF link annotation
    • http://pc75.net/upfiles/file/1631055221.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/zibezo.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/88200526619.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/5821277709.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/mizave.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/54276562645.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/2025621083.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/45180888450.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/menomagalu.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/fuzozotivasaxev.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/9798900877.pdfIn PDF document text
    • http://goref.ru/files/file/60050303588.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/35824235440.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/notadijolukodi.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/jaratejukimubitidazekalek.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sawidomokelopugarenofibi.pdfIn PDF document text
    • http://christopherdallo.com/file/11154450372.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/12799217636.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/91500632398.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/pufebabep.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/17309888373.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/25521549374.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/duru9fmuf0820srlvqlv8d6jb3/24477952857.pdfIn PDF document text
    • http://nscenter.cn/upload/files/10883092748.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/65429399168.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/midoxerafelivetuva.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/mivesumedetezuvetoloni.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_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 10668 bytes
SHA-256: 78c6a6f40433e5f534fcd315f919941b233eecc93d36c54e60bd38a89a543f8e
font_02_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 16368 bytes
SHA-256: ecf34f4021db49c010858fa9d98da15fd2ed2f9c1f977d0b1feb8a684b2a6261