Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a75e3783c7eb4a…

MALICIOUS

PDF

76.2 KB Created: 2020-11-25 14:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7fed082d0e0546654771a696e5086c70 SHA-1: edca4452480fd47d135cba583ac06a4cc56f74d6 SHA-256: 21a75e3783c7eb4a572b1b3bfc7ca67b2215a355d9be7488e780c2a6041cfbe9
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is part of an advance-fee scam, specifically mentioning lottery/parcel delivery language. It also contains numerous external links, with one prominent link pointing to a URL that appears to be part of a link farm designed to increase search engine visibility. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?utm_term=e38+manual+for+sale PDF link annotation
    • https://zepixufiguw.weebly.com/uploads/1/3/4/1/134108583/cdad76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5fb8c69670c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448547/normal_5fbce4d350ec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f88b9d5cb33f.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/defumewikulopew.pdfIn PDF document text
    • https://sigoxavofilaza.weebly.com/uploads/1/3/4/6/134697452/5a68d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_5fb031590f34e.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/c83075e4-3653-4a0a-82ea-fede05aa478e/80990530059.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/full_size_blanket_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ae4a7c-02de-405e-97f0-7b22a6bfc67d/no_seu_olhar_nicholas_sparks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b478cb0b-f9c5-47a6-8efc-800552d783d9/principles_of_finance_with_excel_ben.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/emnlp_2020_deadline.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/89225831184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c6328b4-7136-45ce-a187-cfd43d09f400/desuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013cfd54-18d9-4851-8b42-cd6c688fc4be/nopinowajuwurulega.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_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 5228 bytes
SHA-256: f9ca124dba7a496e600daa5107eae71a9b5bbf1485b158412f3e94881b3f6ccf
font_01_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 11712 bytes
SHA-256: b6a9f032cd9949ae40f15987f9d1d65317d0d69be4d159c50dd91e06d89ff6dd

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