Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cc64d07b71b932…

MALICIOUS

PDF

79.7 KB Created: 2021-03-31 04:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e22de68ca9b5fb087bffe1e58ee194e4 SHA-1: 6a700c8a2eb042f43b323dac412d35793434886e SHA-256: 12cc64d07b71b9325f1854bc83daa4c9e023282f7eb2f71981b9ccbec0273f10
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are generated for SEO purposes, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself, combined with the heuristic firings, point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/award?keyword=bronchite+aigue+traitement+pdf PDF link annotation
    • http://megatorg.ru/hoover_carpet_cleaner_not_picking_up_water5aomh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_5fd2a9f7d5622.pdfIn PDF document text
    • http://merishwheelrecords.com/97331609430tpx4q.pdfIn PDF document text
    • https://cdn.sqhk.co/zirevazul/SmojdRE/free_fruit_carving_patterns.pdfIn PDF document text
    • https://cdn.sqhk.co/ninoporaleva/niQwtzL/car_bill_of_sale_form.pdfIn PDF document text
    • https://cdn.sqhk.co/raxinosi/9LCjgME/mijodakugela.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/g1tejUY/99778192797.pdfIn PDF document text
    • http://front-glass.website/is_iodine_aqueous6y1dn.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/667238716g2edo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_604ec60ae3886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavale/bulepe.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_39d7a23cf0ad4b1f9615bdbfcbc93160.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/carls_sims_4_guide_relationship_cheats.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/97925473691.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/pubanobodolubora.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_5fda7e2d0cf94e869d21ed499c3ba3cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/gelewaneminesijiruvepub.pdfIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_648aa0bed9394bb4886795a1ac609571.pdf?index=trueIn 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_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 5408 bytes
SHA-256: 66ea76fee72df9a5b5d684a7d1249f9adcc3c6a886c323997b131764b93344ab
font_01_sfnt_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 12852 bytes
SHA-256: b08cb6dc30e595aa14b044e4ec4cce1e6ba919b49aba5e93007870b64423a2ec

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