Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5d3b85fbaa8f67…

MALICIOUS

PDF

95.4 KB Created: 2021-09-22 15:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73e140ca28ee57410041423826a1c920 SHA-1: 384fbc9f36788a633d9a79e7eac234bd951ebf29 SHA-256: 8c5d3b85fbaa8f67d73d9b408be7363644a82adb143d191f1424107d47ebc8b6
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, with one pointing to a raw IP address, indicating a potential phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains. While no scripts were explicitly extracted, the nature of the embedded URIs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wamer.org/userfiles/file/puwevotujowuvukokoroluf.pdf In PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zixikenamivukotatorefe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5hee2c7cb6dr4n816c37vceos2/zuxikijutixoreparoxebixi.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109072123597768.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613496c5b7bc4---dovanurukoxekex.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/lotosogap.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/merosidoxeridadizivawiv.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/31398418297.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/30813498982.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/savuvitukezekukegavelaka.pdfIn PDF document text
    • https://digireg.dk/upload/27087929755.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/20566830940.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/pixerogujipozugen.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/38487041084.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/molaxubiri.pdfPDF link annotation
    • https://olgunbey.com/upload/ckfinder/files/13908262028.pdfIn PDF document text
    • http://synergyproperty.com/images/files/kedabumitujuritutixadur.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/mimemufekeralalepaxoworut.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/66939384119.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/6970474515.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/62645497084.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/zalunipidasakorof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=1000+free+followers+on+instagram+no+human+verificationPDF 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_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 18416 bytes
SHA-256: 120486d149f93732a7b55d774e8a6fb26a073d90e7c0228c935e84a90fff9afc
font_02_sfnt_off00015565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15565 11112 bytes
SHA-256: dbf0f0622b516166b46d36ee91b4150b46b93426f47a6d043aacd1b1078e0a97