Malicious PDF — malware analysis report

Static analysis result for SHA-256 051fee7c9b52f301…

MALICIOUS

PDF

95.6 KB Created: 2021-04-19 03:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1d7ed153cf83188c65ffb510384efff0 SHA-1: 297d980f6e613df3b07e7021645a14831e0eed57 SHA-256: 051fee7c9b52f3019f1ad862545c5de86542f1171bed9599344b56a143e18555
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 pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=oracle+sql+date+format+24+hour PDF link annotation
    • http://susekilimu.medianewsonline.com/waramenomedagusuvomobipur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_6056a93e12b2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_60220589bffde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_600e716721993.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/how_to_make_a_bridge_with_popsicle_sticks_without_glue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_604aab8a6fb1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373999/normal_5ff0c80fca312.pdfIn PDF document text
    • http://mekapetakosa.22web.org/gibigimabafi.pdfIn PDF document text
    • http://gonalotuturopil.mywebcommunity.org/mathe_bruchrechnen_regeln.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_60328e949f8b5.pdfIn PDF document text
    • http://fadulifakibul.medianewsonline.com/69909871212.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tagemafizikevu.rf.gd/bufulevawemokesodaku.pdfIn PDF document text
    • https://96a604d4-6f4e-42dc-90fb-b802e1cf4ed0.filesusr.com/ugd/6ef60c_26ebee4e573a44178ecdd5f4a8692daf.pdf?index=trueIn PDF document text
    • https://6090ae5c-070c-4b50-bfd2-11a66789f099.filesusr.com/ugd/83cce3_04b078d3a1934e0ead3bfd44c5d1ab3a.pdf?index=trueIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_a175057f88d04ff28c1b8c12e177e5e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/923d0a4f-26af-4d9e-b087-d7d650004709/milaruxebasa.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_f4a6c48c976847c28849065549b21b72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ebba5d-f8e4-477b-abff-c516266be418/are_dehumidifiers_expensive_to_run_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1ff2aa-886d-4eec-9299-b64d3219f252/mechanical_engineering_jobs_in_uae_oil_and_gas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f5c7b8-124d-4f40-b90d-b2e43669c514/62944621188.pdfIn PDF document text
    • http://wuzuruwevirelu.rf.gd/fish_taxonomy_classification.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 6812 bytes
SHA-256: ca24bdafb8bbb869cbf463ec553f7ebe8fac9d92b2ff95474d77e3f511273adc
font_01_sfnt_off000134ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 5636 bytes
SHA-256: dd5aa7854a8fcaa2a342f61e9b21d354011503d51d143a3742fd5131b7ead123
font_02_sfnt_off000147af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AF 12284 bytes
SHA-256: 8b1b1649ce36fd72ba3e236596f58dafcd3f2c57878e35023c022c94fb7a8030

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