Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c664973f54509d…

MALICIOUS

PDF

73.8 KB Created: 2021-03-08 21:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 010fc6a284cf33eaea5a4503c88b2236 SHA-1: 7cf287ae72229f40edac1ae38fa2f78d04e846aa SHA-256: 21c664973f54509d8f47df9577998752ed11fda0027e72ac32353b50cccf63a2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, characteristic of a link farm, with the primary purpose appearing to be directing users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it may leverage embedded JavaScript or other PDF-specific exploits to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/aws?utm_term=how+to+cite+exact+words+apa PDF link annotation
    • https://dupafubakatato.weebly.com/uploads/1/3/5/9/135961249/4908992.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/h5zgggh/tenasorolim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476427/normal_5fc5bbcba9056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_602d823da113e.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/maxejibofire_fuxojavet_limepovup_jipunesa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490724/normal_5ff8f1cfcdf70.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/25684667c.pdfIn PDF document text
    • https://lepujipalojim.weebly.com/uploads/1/3/4/5/134599636/numesoz-ramikegixefopu-fawurobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_603ccc56e41ef.pdfIn PDF document text
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/tukosabukilex-gotasojixuxuxo-wudinifowubeguf-bepane.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/dZjbIgJ/xukuvujeladorugubob.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/aeLiigf/download_ace_academy_black_flight_mod_apk.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/5359622.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/wofaxil/63694584693.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/measure_of_an_interior_angle_of_a_regular_polygon_with_14_sides.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/days_of_the_week_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/75860458394.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/nigeria_christian_movies_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/como_hacer_referencias_bibliograficas_apa.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_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 5156 bytes
SHA-256: 3ff2e66332f569ad954da33ad7eabebf6c28ab694e6a43bcef544edb7cd5d002
font_01_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 10540 bytes
SHA-256: f97e8b87c4215a10319f9cd226ddeb71442f22f2af6afcc89a4b37253afaae2f

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