Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e027adc79cef34…

MALICIOUS

PDF

66.5 KB Created: 2021-01-04 02:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a708b9229545ee9f557c30331c161e3c SHA-1: ed1b54293990387d4c3fdaed5c3ef0cfe290a095 SHA-256: 51e027adc79cef3495da2e5c6d1d16f344ab94f5b7fb9ad21aa50270fc7a2b3f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=the+chief+data+officer%2527+s+playbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414677/normal_5fc4715026eb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393515/normal_5feda2674d562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5fbc73406c9eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422133/normal_5fcdfefa7fb18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447098/normal_5fa4474b57dec.pdfIn PDF document text
    • https://rariborujur.weebly.com/uploads/1/3/4/4/134443596/jatoxove_detesisujaw_dopejop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_5fda3e8fe86db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445128/normal_5fccce120f1d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_5fd8b5ce86a18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5fb66839c8939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499300/normal_5feb454fcd7d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f87248479ff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_5fbd89504f3d4.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/492583f3-a8c5-4b28-a629-cb5a86218195/the_news_observer_blue_ridge_ga_classifieds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f9c008-d19f-4a36-b75a-1d173f5327cd/vojamo.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_off0000c863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC863 5532 bytes
SHA-256: aeda3dd415f7a250101c45f095d9c6fcbb6ebea1f76f5c3571bf5aee7b55adb1
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 9928 bytes
SHA-256: f744d347fe8eef2f6489b16638bc5c47f5e5a681eee61be7b7e4a07608367817

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