Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f1c6d95af678eb…

MALICIOUS

PDF

70.0 KB Created: 2021-01-15 13:24:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1317721d0ceca7eda76b9b227ff51abd SHA-1: 802eacc22f9a19c2aa27cd6159f131c7daa60ca1 SHA-256: 34f1c6d95af678eba873c3f23907e3af17d8d0e290c89cffaf2fbad8d03b43db
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=world+hindi+day+2020+upsc'. ML classification and ClamAV also flagged this file as malicious. The document body is heavily obfuscated, but the presence of a malicious URL strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=world+hindi+day+2020+upsc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5f8fb63666c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5fbcd11fa8d2f.pdfIn PDF document text
    • https://site-1198015.mozfiles.com/files/1198015/8627034514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485004/normal_5fd77333198de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464869/normal_5fcca9d072f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_5fa2c1c47cbeb.pdfIn PDF document text
    • https://rulovuwupe.weebly.com/uploads/1/3/5/3/135386045/vepurej-kufelipud-jijijegunofoba-lomud.pdfIn PDF document text
    • https://site-1168079.mozfiles.com/files/1168079/ironmaster_bench_pro_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474739/normal_5ffa77e240b5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476007/normal_5ffdd10cd345c.pdfIn PDF document text
    • https://mapizijef.weebly.com/uploads/1/3/4/4/134493838/6784882.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/kosipefojaw/rch_limping_child_guideline.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_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 5548 bytes
SHA-256: ffb95bfb54ac11cffbb2dfc9cf25071d82ba076d17542e2541fabe57a3080cde
font_01_sfnt_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 10516 bytes
SHA-256: 4c58afa3c76ac9efb7641d3b74c9e46c4677fdfc8676c55f33399a9abe86b702

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