Malicious PDF — malware analysis report

Static analysis result for SHA-256 a576c802621ee291…

MALICIOUS

PDF

75.4 KB Created: 2021-02-26 09:36:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9709ab74978375fb15b1bf26d31fac6d SHA-1: 412a4914e666407aae0a38a59fb838eaf1d3b3b2 SHA-256: a576c802621ee291090c4dec13ab55ae0d4679c0111eda1a3f0958412bab750b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to direct the user to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://crophysi.ru/award?keyword=how+to+download+gta+5+mod+menu+on+ps4 PDF link annotation
    • https://cdn.sqhk.co/kululojilo/7DChihe/high_speed_remote_control_racing_truck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_5fdabf37a29af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463272/normal_5fddcece2274b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_602566a00ef98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420235/normal_601ce99ed9af6.pdfIn PDF document text
    • https://vozedebilonede.weebly.com/uploads/1/3/5/3/135333302/demivabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_6011b1ede6d91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_60289125c7af7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392195/normal_5ff0960923807.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/hagc8XL/easy_karaoke_duet_songs_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421471/normal_601fe3da34c3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421615/normal_6009ab9e69c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_60384587c83b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414680/normal_5fc855bff2ec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_602804391e38e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453889/normal_601d372a306ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_602fffe2d9028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 5448 bytes
SHA-256: ab7b17411b4c7f0247fb13973eee0aafcc34ddbc3ec26959959de355d2d73050
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 10016 bytes
SHA-256: 7a046979626fa41d23b4cc4b47686a7301cf2255b161871510931eec081eccab

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