Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f0d9c4bd2671a7…

MALICIOUS

PDF

58.7 KB Created: 2020-12-25 16:30:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6b81a622f6993374224ae019da0ff7e1 SHA-1: c1e5b38f6b7db59c4b4ddc4fde96125ef0b962b7 SHA-256: 54f0d9c4bd2671a75681c69d6a19582c02a775d668f5332ffd2db56d6f3788bb
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified as a phishing lure for free downloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffine.ru/strik?utm_term=classic+phone+ringtone+free+download In PDF document text
    • https://cdn.sqhk.co/bazopaxepifu/ahghege/munimobile_app_san_francisco.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_5f9891dfb50b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5fb5e91f4350a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5fa0d33c24784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f8b5abbc02fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474987/normal_5fce16c526cd2.pdfIn PDF document text
    • https://cdn.sqhk.co/nazabimon/hYigyic/9521928009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403407/normal_5fc90787c4a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5fa2fdbda3a2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f8b115732fb6.pdfIn PDF document text
    • https://cdn.sqhk.co/fojupigek/eaqVieG/60813118604.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7675221b-53fa-4c7c-a8be-5b72c68fa97e/78473139133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd21650-c2fe-40be-b6ea-2c6001a1452c/vovim.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/ngk_to_champion_cross_reference_chart.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_off0000ad69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD69 5416 bytes
SHA-256: 8190ffafea2e6cee3635e90824b879dc56e55167888d230f0d1bb5ca154f5b2d
font_01_sfnt_off0000bfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD7 8860 bytes
SHA-256: f96e014d70c9a380ee5ffaede3e70d50cedfdac42e05e4559a841b176c4a9333

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