Malicious PDF — malware analysis report

Static analysis result for SHA-256 db349de5da3e6b4e…

MALICIOUS

PDF

77.9 KB Created: 2020-11-26 17:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03ba4ad45217541ba7426cf5d3857bd7 SHA-1: d620d91bfb34fde7f97453b44a903d80eea8ab5a SHA-256: db349de5da3e6b4e068e0bfe0b69b8ca11d5f47477dd2e1d5333eaf8b46d11a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=guide+dev+anand+dialogues
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5f8cee8574591.pdf
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fbfbf6a6b7e2.pdf
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/vesogijaraboti.pdf
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fb2a592f2f5a.pdf
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5f90f896e5929.pdf
    • https://cdn-cms.f-static.net/uploads/4476577/normal_5fb76cb6a1143.pdf
    • https://cdn-cms.f-static.net/uploads/4452594/normal_5fa01d623c219.pdf
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5f8ee9c99c8e5.pdf
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f86fee450c60.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/remuv/bupa_ambulance_claim_form.pdf
    • https://uploads.strikinglycdn.com/files/dabfc9b5-6b74-4ecf-bd6a-a8d84dc56711/kabir_amritvani_guru_govind_dono.pdf
    • https://s3.amazonaws.com/poresi/sea_of_flames_diamond_history.pdf
    • https://uploads.strikinglycdn.com/files/18e3fe4b-6a72-4849-98cc-046f754487f4/3830668831.pdf
    • https://s3.amazonaws.com/subud/anaesthesia_for_veterinary_nurses.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d067.bin
85d16c2f725ac6a090c957f5eb5bf01040f78cbf2eab1056e921b4ee808cc434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD067 4792 bytes
font_01_sfnt_off0000e0bf.bin
5c89bcc4ce152b85880da2bb64c3fa06acb97fd26a9a072ac8afc7f7fcdd46a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 11128 bytes
font_02_sfnt_off0001068a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 4324 bytes
font_03_sfnt_off0001148b.bin
4e9fa6b1982554564e05fdc45b4dd3fb6dd2d8fe0e46bd19080d7bb2fda62308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 6212 bytes

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