Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35719a50a1b66fc…

MALICIOUS

PDF

73.6 KB Created: 2021-03-02 21:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a80523bc85479b3dea7e6ddfdb461211 SHA-1: 9149bdfea9a0748ad384b6405fe59c04522c5890 SHA-256: c35719a50a1b66fc11a3581a520f516d94794b92746245c110f8b6050cae6732
66 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 0.9997

Heuristics 4

  • 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://maypoin.ru/wix?keyword=the+beard+bros+games PDF link annotation
    • http://nizavevorupuj.mywebcommunity.org/79767177034.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405639/normal_5fe13655575a7.pdfIn PDF document text
    • http://new-leggins.site/how_to_learn_french_beginnerslos4i.pdfIn PDF document text
    • https://cdn.sqhk.co/pinebiven/iihKJ7P/physics_drop_unblocked.pdfIn PDF document text
    • http://bigojojodun.iblogger.org/guide_michelin_restaurant_figueres_espagne.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/BMDmtjc/cash_money_application_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lawipavoso/xhgcBK5/zed_aram_kr.pdfIn PDF document text
    • http://fusagawi.iblogger.org/courtesy_driving_school_worksheet_4_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/vujalenan/gfhuoja/mukopomozuzelofez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483589/normal_5feed3b383e0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_6019b0f177b9f.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/IufghiC/big_semi_trucks_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_601b79171f7c7.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/how_to_start_internal_audit_of_a_company.pdfIn PDF document text
    • http://maska-respirator.com/guided_reading_activity_chapter_21_lesson_1g5bx6.pdfIn PDF document text
    • http://bilet-pdd.site/lines_and_angles_class_7_worksheet_vedantuv5m51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://marojinoz.rf.gd/zabewofab.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/wimofofofuraxoji.pdfIn PDF document text
    • http://butorinowu.myartsonline.com/husqvarna_128ld_weed_eater_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/90232747639.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/55513759228.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_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 5296 bytes
SHA-256: 69e0c2d7868bb25ab347a652ef284c86aa8ca52b0d1ebae0e59e3e1c5f9a25cc
font_01_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 10528 bytes
SHA-256: b3a7092531a081bb91850dcf4ef8c5681131e30b3610aa12b9bc8be3d020e1ed