Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c6591710ff9c85…

MALICIOUS

PDF

79.8 KB Created: 2021-04-19 23:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 268ff0212695587244cfa8a32d5ce49c SHA-1: c89f2686ff7d6a43c627fc4e154856b1e8ea0d76 SHA-256: d7c6591710ff9c85886d27fa17094da922d69357e1082fa5539b252b91d18e27
156 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 other PDFs, suggesting a link farm or a method to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=toro+sprinkler+valve+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445573/normal_5fe3e05dbe8d1.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/4294867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_60634c022996b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_6044f77c63a69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5ff77327b61a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_601d2bd5d987b.pdfIn PDF document text
    • https://leketupafap.weebly.com/uploads/1/3/4/5/134527175/gijobejodibix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475215/normal_5fe5cf9dad939.pdfIn PDF document text
    • https://zulezinema.weebly.com/uploads/1/3/0/7/130776370/fuvalo.pdfIn PDF document text
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/bf09345c.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/41483d26-2363-4028-a3f9-17269ded536c/tecnicas_e_instrumentos_de_recoleccion_de_datos_segun_sabino.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/aieee_full_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/belkin_wireless_g_router_f5d7230-4_firmware_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d46d86-0292-4d07-b309-3b719c249bf9/does_timex_still_make_watches.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/99140613661.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/31384410397.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/xezumi.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/90898401556.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/rerufututitituvijopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6602a862-5db8-45c0-80b7-9e57e83385ae/kewivetegateme.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/why_does_my_scooter_not_start.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/lagu_di_antara_2_cinta.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_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 5000 bytes
SHA-256: 628de6d2690fc0e8da06908bca70e2ff970492700704fb624e0fe284e696da48
font_01_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 11200 bytes
SHA-256: e5bf74828682b6783619e301e89d10051a812dda2d0697c93aacfb1386a608ee

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