Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3da56a559b609a8…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 15:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4d530dc105c11d038b73d4f083d57d29 SHA-1: d416ee335ec31f17c71aa19452c3653e3f868a4d SHA-256: a3da56a559b609a82c608d931b878b10620a588e4d1e31d639d9578ea7a2c152
186 Risk Score

Malware Insights

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

The PDF document contains a lure related to a Starbucks gift card, directing users to external URLs. The presence of a PDF link farm and the ML classifier's high confidence score indicate malicious intent, likely for phishing or scamming purposes. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/wix?keyword=send+starbucks+gift+card+through+text PDF link annotation
    • http://vanlit.ru/boston_celtics_2018_schedule8765d.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_6064984cc7712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471099/normal_5feb87147b035.pdfIn PDF document text
    • http://itclick.info/organos_del_sistema_endocrino_humanoltkaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_601e4f9f9914e.pdfIn PDF document text
    • http://kurs1.xyz/bufafabatea9lbg.pdfIn PDF document text
    • http://pro-konditer.com/radigetelijubuxembjzbk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_5fd26e2e1b6f3.pdfIn PDF document text
    • http://logoped-samara.ru/431140788605sfn4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_02188cb5db0846f3a9eac138bbf0aa4e.pdf?index=trueIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_8374897d7af64adba4751fd4a9a125f7.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_07cda2d814194adfb118499fc2c17519.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_b327910a8735416590c60d14ea9a0d0f.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_7626829f3a264c7caa0694407beeb123.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_0225b805415347f79b038a1ccd5c6f19.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_fb02f24c6f8b4e10a756c6be92adea35.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_fef9b1d91dfa4a7bb7aac357309d800b.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_3bcdacd49d7a4f6fa30baaf5a9a64724.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_20ed83bbe489466385bd8f5bed315fb8.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 5624 bytes
SHA-256: 64c07165b8b65ae2c9dbdfa73688d7c5e089da71fde2dee1d5800bb82983ee46
font_01_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 10792 bytes
SHA-256: ff4c3fb431bd88814346d7cb49c357277c3bb6b494d748f98a878352d01fff6b