Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a277cfa1d174675…

MALICIOUS

PDF

70.2 KB Created: 2021-01-11 01:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6d40af68dd8a5a51818e0d07c8f6dbc3 SHA-1: 9c2fbee6b7e11f0d9e32b9489c2bb9457ddd6ef7 SHA-256: 4a277cfa1d1746752f59605fb0f8f16a0ed79699d74126e2be1942d51f00da8a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs suggest it is designed to redirect the user to potentially harmful content.

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
  • 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://trafficel.ru/123?utm_term=beyonce+get+me+bodied+bet+awards+2007 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f8db0d7ac417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5fc327829448a.pdfIn PDF document text
    • https://site-1178570.mozfiles.com/files/1178570/skin_colored_mole_on_my_dog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5f8b4d30920c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_5f9aec60a08ef.pdfIn PDF document text
    • https://site-1176991.mozfiles.com/files/1176991/space_live_wallpaper_hd_iphone_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478950/normal_5fce7abd10509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459640/normal_5fafb103194e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5f8f92bdbe6ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_5f8aa02ccee26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_5fb83820c0115.pdfIn PDF document text
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/51f040fbe49e3.pdfIn PDF document text
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/lijet-mekukojaz-nifefafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5fa9ddd8654e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5ff719314e27b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407314/normal_5fe03c0e7ef49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445558/normal_5fd84c0791299.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 5964 bytes
SHA-256: ff01b523b075d9d2658711404c7e636a076bc56b77109bdefdd02f6298596500
font_01_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 10456 bytes
SHA-256: 5a341bce1da1ae9b01636f846b5073a7eca3f93d222675318afd601c0b54e6d3

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