Malicious PDF — malware analysis report

Static analysis result for SHA-256 85051f07b7b9e3e5…

MALICIOUS

PDF

68.1 KB Created: 2020-11-29 10:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bc0b7392ab52f9cf8e75b590eb10f58 SHA-1: 5c7bd63b0907c44ad405b0b4a4a6bea07fbb356c SHA-256: 85051f07b7b9e3e5a0eb8d278471753c6a763c6f14c3c977e79cb470ac2a74ee
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, indicating it is designed to redirect users to malicious infrastructure and hosts a large number of external links. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and the nature of the heuristics suggest a phishing or spam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=lower+48+states+size
    • https://cdn-cms.f-static.net/uploads/4420449/normal_5f964b0635153.pdf
    • https://cdn-cms.f-static.net/uploads/4427828/normal_5fc3223c5995d.pdf
    • https://cdn-cms.f-static.net/uploads/4374840/normal_5f9436b2941bc.pdf
    • https://cdn-cms.f-static.net/uploads/4459320/normal_5fa7d10f2ea4c.pdf
    • https://cdn-cms.f-static.net/uploads/4423429/normal_5fab2ab06f741.pdf
    • https://kefanizitadibuz.weebly.com/uploads/1/3/4/3/134328212/mofofufan_zatinofe_siranofapa_liruzon.pdf
    • https://kopadababipa.weebly.com/uploads/1/3/4/5/134502609/6b426d76c2f0e.pdf
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f96a39a3cfb0.pdf
    • https://cdn-cms.f-static.net/uploads/4486220/normal_5fc04b704b9c5.pdf
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f9ac81a15ee2.pdf
    • https://cdn-cms.f-static.net/uploads/4384469/normal_5f9b990b56f27.pdf
    • https://cdn-cms.f-static.net/uploads/4423715/normal_5fba9af7eb1f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kelageketisefuv/tamil_full_ultra_hd_movies.pdf
    • https://s3.amazonaws.com/rizezobabub/15119796054.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce36.bin
dba27ccb38f38ebe769302a406bb5e9a40bb2dc680035812e2369a9fb3c225df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE36 5012 bytes
font_01_sfnt_off0000df72.bin
55bd0fd51f9b364c39d7f50cb0b13658948725f4aab834be221edcffc9d90999		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 10716 bytes

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