Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f966f1e4e55622c…

MALICIOUS

PDF

65.2 KB Created: 2020-12-23 17:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dbdfd45839c8d469395321905cd5e443 SHA-1: 81dde2e9d399d8fdfbdd1ad284d3b8bfb0eb263c SHA-256: 7f966f1e4e55622c61d1d9186eaf3542461ac939869e94d6addbd0dcc611ed81
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL associated with phishing and scam campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=road+limits+racing+2020+calendar In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5f901807b8f01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_5faf671000c62.pdfIn PDF document text
    • https://kadekorik.weebly.com/uploads/1/3/1/4/131453454/vijekowojebifuf_lowimok_katubupe_wilomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_5f8ace3c11c25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36746562-0c38-4473-93e3-dbf687345ace/bobemufimatugevaditisaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfaf3d38-e558-4770-9221-222d3b271f0e/cane_wood_sofa_set_with_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bb288c-3cc3-4166-a3b7-78d145ae922a/minecraft_legacy_middle_school_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9811227-ec8a-428e-b507-05b3dc0c12fe/29035942725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b80dfa51-87d4-49a5-a39a-b7b96b75d24b/mumox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d651c0-0be1-4799-a741-bc2f206aee31/general_hydroponics_flora_series_ingredients.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ac9362-afc9-4143-a10d-fbf00897febe/albert_einstein_powerpoint_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f98714-09f2-4e31-80e3-bf1277120195/64541493746.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/wenujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f69a63b5-bfac-4af8-9af1-b7fb6c2ed2c3/62813457104.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_off0000c11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11C 5540 bytes
SHA-256: 268b1aa0f48bfde2ed3c53bcd00637ced54cb9e09dd4b31e7e8e189336da7e9d
font_01_sfnt_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 10988 bytes
SHA-256: 0c724ea8bc737770c6d5b11b86257518cefdbfbe8391b040d466d0eddc2ade5d

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