Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cf9376240a6341…

MALICIOUS

PDF

81.7 KB Created: 2020-11-14 00:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 71748971e1189de62a4b4911e6141d30 SHA-1: 9de0a5c4b99f8474104ed2dde0bbf745509db8ae SHA-256: 20cf9376240a6341f0ef57f78435921a5fb268f20ed7afbca016c8d357910273
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to contain text related to an 'active passive voice worksheet', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffking.ru/aws?utm_term=active+passive+voice+worksheet+for+grade+10 In PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/8ac0a5db64.pdfIn PDF document text
    • https://suvejuxib.weebly.com/uploads/1/3/4/3/134380783/wuwowato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5f99f775d41c0.pdfIn PDF document text
    • https://mugekezozo.weebly.com/uploads/1/3/1/6/131636766/vamuru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404964/normal_5f9a6249d504f.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/rubidokezive/sociology_optional_full_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b418b8-4284-44e2-9757-d2be61972c8f/62870245448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887bf1e9-3ae8-4e30-af50-8137db6f9763/age_of_youth_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a86a0f-3b3f-4890-904b-afc4800e7141/99231833873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfa6ffd-f75c-4b13-8bef-5bea0cfa7eae/zuzuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece36096-4849-45af-8dbc-5cc1a1b60cb9/63391509734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a87b321-f531-4c03-8cc8-80ed23c895eb/nepoluboguzanubaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85483cbb-4d6b-4ead-97bd-0b223f8bd308/the_joker_full_movie_online.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_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 5784 bytes
SHA-256: 091d2feff1c67a605bf8f587b5d16dc0aada18ce36240b511bf25a33d6a78dd8
font_01_sfnt_off00011503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11503 10724 bytes
SHA-256: 3e5feeeea64d8c49c30e6a7def1c050e8fd802a68f68cb944f95df852c13567b

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