Malicious PDF — malware analysis report

Static analysis result for SHA-256 efad48bf6fc5f5a0…

MALICIOUS

PDF

64.6 KB Created: 2021-01-04 09:55:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 88260b459b7ccb12ef365eb19658b218 SHA-1: 2d33f6b20132f9f4674c3ee47b3b66e8161eec38 SHA-256: efad48bf6fc5f5a05d0030cd6d6a52a3c13e840a9d63ca61d76723c17fa22781
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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=ks3+energy+changes+worksheet'. This indicates the document's primary purpose is to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=ks3+energy+changes+worksheet In PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/duxujapif_jumepolifi_luzilarumezo_zomiduxevow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fedf594a4a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_5fdc37ae924ee.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/gdVQPgi/nail_art_kit_buy_online.pdfIn PDF document text
    • https://kudoxere.weebly.com/uploads/1/3/4/5/134591480/minudarozomudato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_5fa90b7196d59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476002/normal_5fe526cb69545.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/49b11870-2363-49da-ba5c-f98be7c258bd/florida_principal_leadership_standar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233d76f4-5e55-4b1c-a1d4-3e0cbed5898a/gilepidomafasixozekofugap.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/godizikazopanawuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/64371211915.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/2003_honda_rancher_350_owners_manual.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_off0000bffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 5420 bytes
SHA-256: 8477b92027af3ba9f40150c36edc807ce9a60963992afc81e6c752f5497b3ae4
font_01_sfnt_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 10352 bytes
SHA-256: 4c8c96d51f9fb34d15e1b2ea203d752f06d713c8122d54cdaea9acdd7f643661

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