Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c97ce56446e835…

MALICIOUS

PDF

78.3 KB Created: 2021-05-27 22:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 242a7726092ff8b3cf91bc158ebc0c3a SHA-1: d25a8c8a5c60b37c3d165c5f609659b64772608e SHA-256: 24c97ce56446e835ce0b884c563b455dd7affb44bc93ecd7dacc75af017aa6ef
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 SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/123?utm_term=customers+needs+and+wants+narrative+report PDF link annotation
    • https://nevimemiwuje.weebly.com/uploads/1/3/5/3/135332714/kidopa.pdfIn PDF document text
    • https://tafogufuju.weebly.com/uploads/1/3/4/6/134638326/namorite_wesugezivaxelig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402933/normal_5ff4dcfa3dff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_5fdc78dd17240.pdfIn PDF document text
    • https://sofifego.weebly.com/uploads/1/3/4/8/134899758/1649638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_6025e56aaa722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455381/normal_5ffbc58192ba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_6023e4638185a.pdfIn PDF document text
    • https://lalojitewimagix.weebly.com/uploads/1/3/5/3/135304200/xajinapipadomatal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368768/normal_5ffebada87b7c.pdfIn PDF document text
    • https://zalirusupu.weebly.com/uploads/1/3/4/5/134516706/1854807.pdfIn PDF document text
    • https://vavetoros.weebly.com/uploads/1/3/4/8/134854671/tuzesasanunu.pdfIn PDF document text
    • https://kawifapexevudo.weebly.com/uploads/1/3/4/7/134711131/togapaganofaja_wiledigidu.pdfIn PDF document text
    • https://buvewetaki.weebly.com/uploads/1/3/0/7/130775635/ad22f225b9188ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446772/normal_5ffdb6fa57df6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_5fdb02d382e75.pdfIn PDF document text
    • https://zodukoweferu.weebly.com/uploads/1/3/1/0/131069906/9bfd1b57f32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460980/normal_6006e830d3519.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/6b775fbd-cec5-423c-8288-8500f3fd794b/21165189390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30193867-f114-405d-8e7e-081982bf9300/68046898155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ada2ccc-62a2-4996-86f1-642831f54d8f/descargar_libro_edipo_rey_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ac28b0-f07c-440f-a6a6-81d12406a048/9274956818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6001e23d-0230-4497-921c-0e0bc1249e71/mini_brindle_dachshund_puppies_for_sale.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_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 5128 bytes
SHA-256: 24e482851201b6f78efe421bc4c2606bb185e1f57900cf42be5d0773931ddd92
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 11192 bytes
SHA-256: 163979a512942180e23546b20aa78c4168b568556e33507dc5c8225df6516a05