Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32658c61d9fa125…

MALICIOUS

PDF

70.6 KB Created: 2021-06-08 09:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3aa4252eb7282247bcf03aa66400ff74 SHA-1: 0b62cc34f8bba53492afdd31d11bb48184bd6d12 SHA-256: f32658c61d9fa12574ea09b7e53fa5408bbb05cf33d142274a05370f27ccdd9f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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.
  • 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://fokemale.ru/123?utm_term=how+to++fastq+files+from+basespace PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4366036/normal_60b1f4ce22521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_6051502901808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483864/normal_5fd841ebc3678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_604a1946d6ab1.pdfIn PDF document text
    • https://fukuzemuk.weebly.com/uploads/1/3/5/3/135306557/4368562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_6014a523e5a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494149/normal_606d5b7bcd82f.pdfIn PDF document text
    • https://guxewegitonis.weebly.com/uploads/1/3/4/3/134336720/a56c2dd43b71c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390382/normal_5fe351bb55fb4.pdfIn PDF document text
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/0efd96d2e9055.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371248/normal_5fec182dec012.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5ffa854ab4a25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_60639f5f297d5.pdfIn PDF document text
    • https://vefaruturibil.weebly.com/uploads/1/3/4/5/134525254/e0b0d329c70b26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456728/normal_5fed6075070f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fd8a08c68a10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_6055fbb359adc.pdfIn PDF document text
    • https://limumowitizuwag.weebly.com/uploads/1/3/4/5/134587832/7386746.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/dc744aa7-4a1f-4899-a829-4a5b8652ddad/busijavafojebomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc308b42-6371-4cdd-99e0-a3cce8297781/laura_mulvey_visual_pleasure_and_narrative_cinema_citation_mla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2334ceb-6f28-4d12-a535-b9c74927d1de/sisuxusodav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3b11e8-d5e7-445c-902d-89d508a799e9/83795093651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229a2842-6a70-47f9-b7fc-fa1f3459f2bb/motugugezemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03d1ff8-7e17-45f2-97db-2631eb64ff94/vatoxefunotarelivikewiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6a1e58-8781-4971-afde-ce65c09827d2/how_to_facilitate_virtual_meetings.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_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 5480 bytes
SHA-256: f352332836f22cc53bced0e0b757bb567104b8eb28ca892cdf0fed1748d861f3
font_01_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 11364 bytes
SHA-256: 21721779f15850ec64eb4c5531536b6025d6c44eaa44b82d2438359664760ec7

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