Malicious PDF — malware analysis report

Static analysis result for SHA-256 c879b71329ac268c…

MALICIOUS

PDF

60.9 KB Created: 2020-11-10 18:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7323270152b191992731266d700f383e SHA-1: 655fd0ce9ddecb17915984b818ecda4888467c56 SHA-256: c879b71329ac268c04f4721ee81fd525adebd7ecb31e6eacb4003beafead43f3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a strong indicator of phishing or malware distribution. The ML classifier also flagged this PDF with high confidence. The embedded URL is designed to appear as a search result, likely to trick users into clicking it. No scripts were extracted, but the presence of a malicious URL is sufficient to classify this as a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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?keyword=memorial+junior+high+school+nj In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_5faa3ee87ec2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_5fa79a54789f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5f9e2534bd5b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f87f003419a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_5f8f969733e95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_5f96eefe9b2b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_5fa8703c4e4d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5f9c3e1f320ba.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/jijumupade/gst_tax_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/vopadofugon/showbox_4.82_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/prayer_of_praise_and_worship.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/aiphone_lef_3l_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/causes_of_depression.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_off0000b206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB206 5292 bytes
SHA-256: 026083a216ce8d3582f192eaddc7f82c767b39b5c850f2ad7b24b8e182bffcbd
font_01_sfnt_off0000c3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E9 10268 bytes
SHA-256: 0c9bc4cba806d67be50c7f26a699b8c594501b83993dab1fd5b02512d2e56a3d

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