Malicious PDF — malware analysis report

Static analysis result for SHA-256 878c4a01a42e4be0…

MALICIOUS

PDF

65.8 KB Created: 2021-03-04 11:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 015f9e6c2d846799b199a3f9edf30eef SHA-1: 56312b823073787d6ea69e5cf9c597277959a9c9 SHA-256: 878c4a01a42e4be014274d203f167ceb8f2580fc957206d37a8f5bfc886678f4
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'the odyssey study guide packet answers'. The presence of numerous external links suggests an attempt to direct users to potentially malicious content or phishing sites.

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://dafemum.ru/wix?keyword=the+odyssey+study+guide+packet+answers In PDF document text
    • https://cdn.sqhk.co/tokafumotebi/vigzjih/39440196267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381546/normal_60362be174173.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/2729049.pdfIn PDF document text
    • http://zijafanovidiz.sportsontheweb.net/food_safety_inspector_jobs_melbourne.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460247/normal_600924104614d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369158/normal_5fd05bec2ee62.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/ZjjidjX/infinite_flight_simulator_mod_apk_full_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5ff13c63d21c9.pdfIn PDF document text
    • http://b4shop.icu/bewednxy6t.pdfIn PDF document text
    • https://gesamuju.weebly.com/uploads/1/3/1/4/131453574/1019122.pdfIn PDF document text
    • http://topsale.pro/vikoxuxiwiwaboge6k81y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365655/normal_5ff288f186e92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476274/normal_5ffe0bb43261c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427295/normal_5fd07054d854c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vigexosav.myartsonline.com/kusujavo.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_off0000c4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BC 5508 bytes
SHA-256: f3f1a47b368cbe0230c6a3b168869201234660dd999fb3478f842fc3e0043401
font_01_sfnt_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 10016 bytes
SHA-256: b9174b0c295a4a5e44136601aee98547d611ea8936b08fece774052c1e693374

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