Malicious PDF — malware analysis report

Static analysis result for SHA-256 7907d764f5bc9e3f…

MALICIOUS

PDF

68.8 KB Created: 2021-01-14 02:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a81af677fd9ff72b4a5d971587287ab1 SHA-1: 7a3cac091a872b1860e7fb24d9470e81e8e5c6ee SHA-256: 7907d764f5bc9e3fcc5d7c4811ca3d5e807ffe7cd38fec69daeb2801c0b4a367
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or malware distribution attempt. No scripts were extracted, but the presence of numerous links suggests an attempt to lure users to external sites.

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
  • 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://cctraff.ru/123?utm_term=extensible+boom+platforms In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f86f86516bc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422897/normal_5fbb3d5bdefef.pdfIn PDF document text
    • https://vubujoxesawuzar.weebly.com/uploads/1/3/4/4/134476738/29227b6e9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f874d0bc44fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501659/normal_5fef54ad3adf0.pdfIn PDF document text
    • https://pujuferot.weebly.com/uploads/1/3/4/6/134657525/riberagewot_lepapuseworepek_tirupim_bedagubosozew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5fb29aacd2dfc.pdfIn PDF document text
    • https://megogolu.weebly.com/uploads/1/3/4/3/134314378/xomidafojatidukefebu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/airport_utility_5._6._1_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/sociological_criticism_guide_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/62807708150.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/vudizoxububasixi.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_off0000d047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD047 5212 bytes
SHA-256: 99f7fcc3be2c772916899fdfe1691de7978dbbf418046fd334af55659801f060
font_01_sfnt_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 10704 bytes
SHA-256: b82a15776879f141cd55aa1fe4833696353d6b8d4f51aa31ae016e481bcbb21c

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