Malicious PDF — malware analysis report

Static analysis result for SHA-256 da376de280b9fdb3…

MALICIOUS

PDF

70.7 KB Created: 2020-11-30 05:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 67a398200dc0350155b8f44273b1a35b SHA-1: dcddcebc5e4c88b89a331b89d00a6503e1588200 SHA-256: da376de280b9fdb331859fea3cee5af76bae5505be0f9606eabf6990f784509d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffmen.ru/strik?utm_term=npg+2020+essay+scholarship+contest In PDF document text
    • https://tatemisi.weebly.com/uploads/1/3/4/5/134596356/8f00cb7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/097deff5-a8c2-468a-a73f-e0fa9497be0d/cinemark_ann_arbor_movie_showtimes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e229cc-2dda-4424-bfd8-049c14c6417c/complex_machine_definition_science.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/titunazokemigag.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/wenuguzesaxiwunonoxuzoxez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3207bf-8f20-4df7-b0de-c810a8e64e60/76374135521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443fca04-5272-429e-b0f7-9ee53d8bd2d8/82767438307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2779ad-64b9-47e7-8496-67970efa1e60/argumentation_aufbau.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a5cced-21df-490c-9190-c42325206afc/rajisijezutuxawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4d0ebe-a83e-4ac4-8bd2-f84bee2e75f5/dagonepemupu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 5328 bytes
SHA-256: 6048ab702c4d2baea8d6e086e480dd182c51e6e4311f5f2193dfe7888d5417ee
font_01_sfnt_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 10620 bytes
SHA-256: fe039cebd60695b644e5a8568c61dec577cd286d07fc914d200c5f726beb800c
font_02_sfnt_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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