Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ca861d6f925362…

MALICIOUS

PDF

66.2 KB Created: 2020-12-15 12:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f2986faf245741625575d58afb4839d0 SHA-1: b47e1a84dc11f38cd26a5d2908e6b6f2cc2403f1 SHA-256: 18ca861d6f9253621b4d873f76bb84cb83a1c59ebee27091f49efa0926568c09
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=charles+law+formula+to+find+t2 PDF link annotation
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/0c233f6c23e4e.pdfIn PDF document text
    • https://benefirezunaxo.weebly.com/uploads/1/3/4/8/134864331/tapodewikirag.pdfIn PDF document text
    • https://lafotavesa.weebly.com/uploads/1/3/4/6/134633764/9a00bf7420a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc0ed012e537a05ef0936a0/t/5fc0f6b3e18c5c478e1e7bf1/1606481588276/ptz_camera_system_installation_diagram.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5a3a111f6a41984a5f629/t/5fcd0b822fa8bc6bcded5f6a/1607273347529/8741237979.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/fig_19_word_cookies_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/90246910238.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/school_loop_login_wchs.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29ae5bdb33045eecd1eec/t/5fc4041fbc819f1cf455c345/1606681632109/gibson_sg_wiring_schematic.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1480d27a199023ab7f389/t/5fc346b33485235c8630923e/1606633140356/16844129398.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/cognos_report_studio_intersect.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/battle_ground_school_district_washington.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94C 5276 bytes
SHA-256: 844e2a45e0e8b52ed51ab5b1ec64d586e8ad0e7663c74b06d5688c02554ef13d
font_01_sfnt_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 10132 bytes
SHA-256: 4c78dc1d6d1dac8c6582d85ca84c73b318fbb68c04acc54f4dd3b22be0de56fa
font_02_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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