Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c885601119349f9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 14:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ec66ebf73e80a4db41539929ce5173a SHA-1: af891b33c4a0ec0e7da1d5bc0732a4fc324ceac1 SHA-256: 5c885601119349f9649e9c993a39fe97f4db2aaf0c3b855cf3304c4be2d541cd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number. The presence of numerous external URLs, many pointing to potentially disposable domains, further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dpnovelty.com/upload/files/80931740602.pdf In PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/30399731899.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/76784402618.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/kikidora.pdfIn PDF document text
    • http://innotack.com/userfiles/file/70205970682.pdfIn PDF document text
    • http://clingac.es/d/files/65909529364.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/dotifoxexetesupexudelux.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/23496818638.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b69ad6a069---20467262529.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbfa3205f---6374340382.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/91428001485.pdfIn PDF document text
    • https://austarpharma.com/upload/files/42713382387.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/60167119527.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/10029751678.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/13364128782.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/bagiva.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/51002488754.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/83462956646.pdfIn PDF document text
    • http://slsnn.ru/content/files/vegiduveruxudeluborevopi.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/kununapelosamudotorelori.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/88963981074.pdfIn PDF document text
    • https://abss.pt/userfiles/file/22305029470.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/zilura.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/34871760276.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/81154271340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=persona+4+quest+52PDF 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_off0000d3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 10540 bytes
SHA-256: c02cd8065237447cbcb4feaf5a96432d02087e58eac13f6f40d9ce568a1e851a
font_02_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 18656 bytes
SHA-256: e6934ebe6f7eb7bb4df5cacff95b7f678ab19b57a608cbbbcea93aee82318d94