Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be8d04e519d2b62…

MALICIOUS

PDF

80.5 KB Created: 2021-03-09 16:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0552f9183824f82f06e5dc8bf994bdb8 SHA-1: b028481ce3f6037e623bf43770506e2b27d9662b SHA-256: 9be8d04e519d2b621413e7158d91f5aebe5423600ac1a922e034100ed6ca4dcd
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

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.
  • 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://kuzutuzo.ru/award?keyword=joindre+des+fichiers+pdf+en+un+seul PDF link annotation
    • http://kevekozulanilim.sportsontheweb.net/straw_man_outline_examples.pdfIn PDF document text
    • http://kimidenexikox.getenjoyment.net/xunogenenuzejigedezomi.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/pufofa-safunukekefufun.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/zumuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_a51dbd7c6aa34f82855d723b1bb5043a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fab9217-1dc0-498c-b0e9-f4bfc104cf68/90326751592.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/how_to_use_turtle_beach_xl1_on_xbox_one.pdfIn PDF document text
    • http://gumomexad.onlinewebshop.net/66142771244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25704205-e51d-49f4-b59c-75d1567179f1/xadadafisafugafomise.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_2e63eb21c2c44756973c3456c93f471e.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_0d6dbdb388e644f5aaa538cd3b76afb9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32e150b-1e90-4856-8fb4-7aeae2cc6bf8/86647196513.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_a9ce6838df6444caa526b99766f320fe.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_7edd1ac0a456438fb06eafa7cf4e8c31.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_aaf5034bc70442a8b81629cabca51f6c.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_2d9ee77e5f384d569789d22fbef7a08d.pdf?index=trueIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_401861c137864c3192d2355c547986d0.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_4239024b09a84a8f93cfee28acd38bb1.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_d01671e05eab436083b1043a438c5d9b.pdf?index=trueIn PDF document text
    • http://zibevili.onlinewebshop.net/rogipelazaruw.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_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 5024 bytes
SHA-256: 8bf86007c41d55d1aaf0fab2b91a43b9572e58b7c1340e03f816b04b38b8bf38
font_01_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 11956 bytes
SHA-256: f95816d5190081b75307e7b0764b930f649ecc65ba86813c44182052b407cc1e