Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ecc02d75648754…

MALICIOUS

PDF

67.4 KB Created: 2021-01-11 17:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d169e8d8a5bb6f5407ff0abfe9b58d84 SHA-1: 57d3bc8019adb2532f8f97c62f6531a787455155 SHA-256: 20ecc02d7564875473b58c4f6b001f7d8f88fca4b88232111e07a52f149ed35a
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector at 'traffine.ru'. The heuristic firings indicate this PDF is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=performance+appraisal+pdf+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4449996/normal_5fde2e2e0dc54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fd14541d3c88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_5fad5a8bae6a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5faa1257b5f85.pdfIn PDF document text
    • https://dibetoxiruvon.weebly.com/uploads/1/3/5/4/135400859/243065d07ac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_5f9704c5d44f1.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/nilifa-relafivejufo-jujegeletuma-lekil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5fc5491ab4331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5fd63aa391a99.pdfIn PDF document text
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/6367104.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/vikukinumet/financial_reporting_l_g.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/64865824498.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_off0000cd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 5300 bytes
SHA-256: f117d20883f5ebbf766560ce587dd89d47654ba0d04b1caba0aaed5ad144b0f3
font_01_sfnt_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 9972 bytes
SHA-256: c191c7b23fe862e86d868f70537904b08edf9ac8c64cd2990682e622b8e69757

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