Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b2d8eb7665299c…

MALICIOUS

PDF

67.1 KB Created: 2021-01-10 08:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8e4f9dccd56cbbafaa746e5e230fb9ea SHA-1: 007169a0ed5b469ce65381e72db697c7d7a9f65f SHA-256: 28b2d8eb7665299ce1d914a445dcf15d4a60fe5f6ade76341e3864423cf8ea8d
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to known malicious redirectors or potentially malicious content farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a clear intent to redirect users to harmful sites. While no scripts were explicitly extracted, the structure and numerous links suggest an attempt to lure victims to phishing or malware distribution sites, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cctraff.ru/aws?utm_term=fractions+to+decimals+worksheet+grade+7 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424985/normal_5fc06956701d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384050/normal_5fdd7fc194323.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/2636586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410030/normal_5fe46ffe50472.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412909/normal_5feb5cd6efc7d.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/jhahm1E/61970159003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366040/normal_5ffa97467b587.pdfIn PDF document text
    • https://kavisovilige.weebly.com/uploads/1/3/5/3/135308643/1758615.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/lomogas/busugipex.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_off0000c9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 5544 bytes
SHA-256: 0f0f24360895c8f76ac72018096ad667e6668368dbcb7e3a9f1dce1ebb0faef9
font_01_sfnt_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 10356 bytes
SHA-256: c8730d8ad64b6509ae74d32cc2346914f3a917c51c57954848f65eeb4f783625

Open this report in the interactive analyzer, or submit your own file for analysis.