Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efad2a1fd5c25ec…

MALICIOUS

PDF

145.2 KB Created: 2020-11-14 02:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6c23c58e0400576236a3dae141ab770e SHA-1: 408cada834db0843ca3d8b67baefc0dcb10f7ae7 SHA-256: 7efad2a1fd5c25ec779666c5b7171c1860b47f6a66182d5a2ee207d8a6afe014
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 indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URL points to a suspicious domain, likely intended to lure the user into a phishing or malware download site. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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/strik?utm_term=mayuri-+sama%2527+s+body+laboratry In PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_5f9be96d4d44b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f8a0faa7d66a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_5fa230b832481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5f983fbceefac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5f8fb01d9fd6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5f8e277474282.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/minaxigevani/kuxuririlafapeboju.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/need_for_speed_iii_hot_pursuit_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/henderson_municipal_court_pay_ticket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3446945-4c09-48e3-b8c8-f144940bc3d6/rimodugo.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/lowe_s_stock_history.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/7023953100.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/angsana_new_font.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68267620-c95d-472e-955a-c1d7ab8b1d15/41669038110.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC51 7696 bytes
SHA-256: dd6d7c3164da87faebe33373d8227bf6110408f3c15439f1501862a3be107af6
font_01_sfnt_off0001e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E68C 5284 bytes
SHA-256: 20ecdf006b0cc8daf4983e99456aec27787c29ea9e5a629144bb76d5d52b6058
font_02_sfnt_off0001f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F888 12652 bytes
SHA-256: 6a0b61ac2e63f0bc6335716e2225e322734380f180498c4481c3ccd3824f7c69
font_03_sfnt_off00022142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22142 16132 bytes
SHA-256: ca0bb856d51d4c440eb4e48db524e4b4a87bf80294704eab3ae97752e74326e1

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