Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be0a1772f72ed01…

MALICIOUS

PDF

146.2 KB Created: 2020-11-09 12:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0fa2ea79a8718e267f8aeec51b9571e5 SHA-1: 25bc9745b1ff768fe6c29fb64043539f12813e3c SHA-256: 5be0a1772f72ed01fe179c1d72e42067871774ea978ee1cd721fa468cb91be17
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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://trafficel.ru/123?keyword=codingbat+python+string+2+answers PDF link annotation
    • https://tewubituzidebu.weebly.com/uploads/1/3/4/3/134359488/f372711.pdfIn PDF document text
    • https://mivosubewo.weebly.com/uploads/1/3/1/4/131407796/nepusu.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/ronusesokowagu_kemoxusaxa_gemejabuwul_luzabufegapix.pdfIn PDF document text
    • https://damokilusul.weebly.com/uploads/1/3/4/4/134463963/d22f4.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/jezaxojipevu/dojefem.pdfIn PDF document text
    • https://s3.amazonaws.com/vibove/mcoc_bot_arena_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8756ed93-6ff1-4033-8ba3-807a161021d5/calendar_2020_eid_ul_adha_date.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/asi_se_dice_level_1_workbook_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/apocryphes_bibliques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8de9f4-6ae5-4dea-9802-75d16a19dfae/leadership_theory_and_practice_northouse.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/93534767955.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/carmilla_story_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8feaa893-8063-4e6b-9e70-471f8df6458c/rujawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d66126e-0c6d-4eb8-b624-a6bb28fa6d51/ukulele_boogaloo_rainbow_connection.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/apkpure_apk_app_downloader_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f28480-3251-4dca-8132-b2b6960985ee/vumejukasuxosuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad80ae5-83d6-4df6-ac48-afabd368fe36/pikakefetineme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429a5706-995b-43be-8262-fd3d62b8fb0c/33482599301.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_off0001fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE3E 5560 bytes
SHA-256: 385dfcefa32a085f306883a7c4996384ae90375f4dac429d75ca7932dde5aec6
font_01_sfnt_off0002112c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2112C 12232 bytes
SHA-256: cc1a06de674e01e670cc29da98cdf753d36caf6cb27fd8d2423f6b0b63bbd9de

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