Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2c3cb325f2b824…

MALICIOUS

PDF

69.8 KB Created: 2021-01-01 13:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ca44983bca348401ffce405b99343216 SHA-1: ee943273bd794fb017a3cebd501d891bc195ce0a SHA-256: fc2c3cb325f2b82452685967667dc03367e370207b8243c8cbb74ad34c1f4db8
154 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, suggests a lure related to "Budget challenge week 2 quiz answers". The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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://ggtraff.ru/123?utm_term=budget+challenge+week+2+quiz+answers In PDF document text
    • https://cdn.sqhk.co/samumosoxivi/nRdjfif/44880624533.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461780/normal_5fcfec33aa945.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/haiigik/android_tv_box_remote_control_app_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_5fe8f8f0defd5.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/hfNvxsK/does_find_my_friends_work_on_apple_watch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_5fa77e912bfc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490365/normal_5fd84dc93289d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f1c114-ac57-461f-b867-ec782ed9d081/ridefalumavovonogefudorig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054633d5-479b-49b6-855d-0863ec3c1b01/kajijele.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/anger_control_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45048095-4b7b-44b6-94e0-3905b56c2b56/kivefuw.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_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 5712 bytes
SHA-256: 9c9d7e7862d5b1074f2effbb6a92670be9ba389f5c6ee8732e9b14c11bddcc37
font_01_sfnt_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 11676 bytes
SHA-256: c68b0c1fbae3c31048e88bb0c73041208191b6650e942a4385120722d6a16829