Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1fd80352271d14…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 12:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7765046dcbf583375cad3573fd2c808b SHA-1: f9d1d4cb67a7a8676fac8d12027aa147e0566107 SHA-256: 8e1fd80352271d14b4d3f6faa03f8af6e7d16c2a387b26f70da66d72734ddef0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=a31+android+version PDF link annotation
    • http://sarkar.ie/userfiles/file/86967924125.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/nekovupoxe.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/8693579621.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/buzivado.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/7625698264.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109131635504588.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e3da4d29---gigijazosimibekisoninilaj.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/40968070908.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/51007615373.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/74311437632.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/78251838304.pdfIn PDF document text
    • https://svltv.in/userfiles/files/pavapabe.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/16844673486.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/20217785401.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/9163546440.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/jerot.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/garavesozufalusobagixakam.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/kuguzuxuxepalurevijoga.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/xasakenelukuvunu.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/sobepobaw.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/dokiwekuwus.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_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 18812 bytes
SHA-256: b9d8b0a184c199a562d055321d57a129989cffe0a9bceecd7f4a582109d94a36
font_01_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 10368 bytes
SHA-256: 7055e15ca1e86d62ebbc29c7bec9ef88273a3a1cbc430f95d8f8c9b9d7e2e475
font_02_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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