Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a9f46eaa4d761d…

MALICIOUS

PDF

72.9 KB Created: 2020-12-29 11:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb23aac44d948633a9dd4c3d7d5cd546 SHA-1: ea826402473e15783056b5147f62e602044e5afd SHA-256: 98a9f46eaa4d761dbee551328127f3d17c11d7eda940c3019ce5ea6149e534bd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or redirection scheme. ClamAV detection and ML classification confirm its malicious nature, specifically flagging it as 'Pdf.Phishing.Trojan'. The embedded URLs, such as 'https://trafficel.ru/123?utm_term=multiple+impact+bullet', are likely used to direct users to malicious sites or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/123?utm_term=multiple+impact+bullet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382770/normal_5fb042ff184c1.pdfIn PDF document text
    • https://keberalu.weebly.com/uploads/1/3/4/7/134725283/kumalomanudiko.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/0d6efe9a62.pdfIn PDF document text
    • https://cdn.sqhk.co/fololekumi/ZJDria0/airbnb_customer_service_number_host.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476418/normal_5fdd9b32b4fa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482415/normal_5fcd9eb965101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5fe4e565aceda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonabafat/accu_chek_error_57.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/44240679940.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/chava_marathi_book_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/27755251428.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/mibewovib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0ff6dd-e529-40e5-b6d1-ca5caf42efac/vudigewoxabelirepil.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 4952 bytes
SHA-256: 41fa6d4cb02e970a74a52f9f392eac7204942dd45a5f52d9f8fe4833d5b1d162
font_01_sfnt_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 11316 bytes
SHA-256: 309dabddc0f178fc5f72a5e673ec857c1dede39478c7ce6f2fcfd35d3f117e9c

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