Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb6a03f37cf6b92…

MALICIOUS

PDF

73.4 KB Created: 2021-03-31 01:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b345b8895c3135230fad38d9d3205a47 SHA-1: adbd8f50fbc5383250c702088e85ff8911eefd4f SHA-256: beb6a03f37cf6b9208c81b2305825812dca6f1abedf421d305f78ee8c5a3ade4
96 Risk Score

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 0.9998

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://jottigo.ru/award?keyword=convert+cdr+file+into+pdf PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://gabavogafev.weebly.com/uploads/1/3/4/0/134000006/favomegi-lafagolobuzidot.pdfIn PDF document text
    • http://onesmall.space/74842924793tne1e.pdfIn PDF document text
    • http://otshelnik.net/plc_course_in_coimbatoreblsn0.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/pujasejara.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/8533251.pdfIn PDF document text
    • http://lokotahas.ru/tovopudirifokow7p94p.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/dezajok/how_do_u_say_thank_you_in_mandarin.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_342c4fba6ffc45b688740ab96deb9e86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujanozo/barbados_us_visa_application_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/jubalo.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/73995785628.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/no_baking_sheet_substitute.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/fidupe.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_aa34f69f0c7f4b63bfaa011e63f3c13a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/free_easy_drumline_sheet_music.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/what_is_the_message_of_monsters_inc.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/free_daily_weekly_planner_templates.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/how_to_write_a_self_annual_performance_review.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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 4728 bytes
SHA-256: ba9eaeeb9c6425a8b6ec8fede4b1da35a6b7e2845219fcec4aea5a3a2fa5df6f
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 10700 bytes
SHA-256: 7d8de3bdfacfd4e669250bfbb2d7468e1479295b5c1cc81ff10afea5ea774b63

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