Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df41b700e198c79…

MALICIOUS

PDF

64.2 KB Created: 2020-11-25 15:52:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c28499cf890eb2981ebf77994c41f2e SHA-1: 4b1df35bfcea9394458b6ee83a59d51756b92b7b SHA-256: 3df41b700e198c791d9bca99b23bfacd772db808c1b9cd4cbca8902d8915339f
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a 'cell theory crossword puzzle answer key' which redirects to a known malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=cell+theory+crossword+puzzle+answer+key
    • https://wadezirukabag.weebly.com/uploads/1/3/4/6/134668274/5447663.pdf
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5fb775440e839.pdf
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f87173925de1.pdf
    • https://fisalusul.weebly.com/uploads/1/3/4/3/134341538/nobiwe.pdf
    • https://najilemizosi.weebly.com/uploads/1/3/4/7/134730194/76473cdae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pazerogasarinu/50619696117.pdf
    • https://s3.amazonaws.com/povodijirig/34609666201.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/93635610387.pdf
    • https://s3.amazonaws.com/rivazixexuguri/corporate_wellness_market_report.pdf
    • https://s3.amazonaws.com/juliziwojatige/99063392859.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_off0000bf8a.bin
4c83c07371de13e6b6684c35cd11200e42c82710dde68d7d3d3119f2427a9cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8A 5372 bytes
font_01_sfnt_off0000d1ea.bin
e2a6ab645ba822daa8adb9f1335e1b4f9ef82944c7440290878a2bf3ad5d64e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 10056 bytes

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