Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1d69c03e13f17c…

MALICIOUS

PDF

111.7 KB Created: 2020-11-14 10:31:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 71ed2843380179fa282f5affd48c090a SHA-1: 5699171ebbb015d96ad85c8d575e57c42539d79e SHA-256: fc1d69c03e13f17cb6dc248ae180f377796e39884145f0a316a25ea1523650b7
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. It contains a large number of embedded links, suggesting a phishing or link-farming campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=paul+rotter+the+flipper In PDF document text
    • https://duvujisukodat.weebly.com/uploads/1/3/4/6/134674851/6457609.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/54d21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5f8d27a8b19b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5fa0b334a20cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5f96e218c2435.pdfIn PDF document text
    • https://dosifezo.weebly.com/uploads/1/3/4/6/134619581/768508111000f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f87724b26a01.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/52c4165b-e128-4fa6-9f95-d84ed6bddd02/nikukuvuroxufozomatojixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85538400-4d16-4468-8554-83ec2d547007/95693641488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfd17d8-4836-4279-b9cd-41bb67ff97b0/83600510820.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/wosuroz.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_off00017a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A97 4812 bytes
SHA-256: ed6160205de5369b06a0cc477c870d8f664600f44c4a3f31323f8fc0b7d5712f
font_01_sfnt_off00018af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AF3 11608 bytes
SHA-256: 4ecb78651303066967379349e7894d70df406f0e08fc9165d054c1a6ba1bea82

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