Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dedfcf576739699…

MALICIOUS

PDF

66.8 KB Created: 2021-02-15 14:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f01460bb63e9542ac880fa6095890ec2 SHA-1: 9c53b3f583800d4f44a67c9e25044c1dca136c5c SHA-256: 2dedfcf576739699f9bc6409e2d22bc04d5d0079cbfa45afcc64134f34cf350a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of malicious links and the document's structure point towards a phishing attack designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=the+industrial+revolution+begins+dbq+answer+key In PDF document text
    • http://beremoter.online/roligupol3b5w.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/ZA3ibgj/bubejatu.pdfIn PDF document text
    • http://prazdnikprosto.ru/faa_far_part_23qc7oo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5ff6ade8e612f.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/jiDiajg/juludatilodalelul.pdfIn PDF document text
    • https://jofusowosa.weebly.com/uploads/1/3/4/7/134764533/e6653587.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/jnFhbB1/22219518786.pdfIn PDF document text
    • https://dagatofolake.weebly.com/uploads/1/3/0/8/130874029/1ffb114.pdfIn PDF document text
    • http://kwini-fini.online/bike_race_3d_moto_racing323fu.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/ig408hn/contacts_icon_aesthetic.pdfIn PDF document text
    • https://cdn.sqhk.co/xolilipedeko/61ibKUS/nbc_sports_network_optimum_long_island.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/djhUhhZ/jowivebezugababimanoraxit.pdfIn PDF document text
    • http://tikovg.xyz/napororefetukexamiiwo6o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopadobaxu.rf.gd/42359395805.pdfIn PDF document text
    • http://zotoputoxo.rf.gd/ave_maria_caccini_violin.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_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 5620 bytes
SHA-256: 383b545d32a67049439b0bd1923d3ad0f8f37c6cee8dfbdd0540f8cbe4231cf4
font_01_sfnt_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 10168 bytes
SHA-256: ffd62962df6f62992353c3f75887a9eb18fd08823c986c826be14262b9d08cbf

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