Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbe7dccad53be5a…

MALICIOUS

PDF

76.3 KB Created: 2021-04-02 23:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5e6ddec94f0584ffe1541097359e4ae SHA-1: 53587dbbfdbee25b95f00f2e16dcda398648d1b6 SHA-256: bcbe7dccad53be5ad35fc32c650fdf68a61a737ce61fdb8a0475793f1a3617d2
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are generated in a way that suggests a link farm for SEO purposes. The primary URL, 'https://dafemum.ru/strik?utm_term=nordictrack+a2350+for+sale', indicates a lure related to product sales. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=nordictrack+a2350+for+sale
    • http://memenakamawe.iblogger.org/production_capacity_planning_excel_template.pdf
    • http://cmb-accueil.com/bagutorogajovikarojabisbvmx.pdf
    • http://opt05.ru/ligadinegebusutefitm1rg.pdf
    • https://birirewenojitu.weebly.com/uploads/1/3/0/8/130813362/tojupazemixiluw_soviranije_juvezemogulikot.pdf
    • http://hotsales-com.xyz/191841546960nhx9.pdf
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/9616674.pdf
    • https://fodumalape.weebly.com/uploads/1/3/2/6/132695584/5c0206a.pdf
    • https://gekubunog.weebly.com/uploads/1/3/4/2/134235395/gekoperavorokisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/retobifulipo/86538586763.pdf
    • http://segixiw.epizy.com/eliminar_virus_adware_manualmente.pdf
    • https://s3.amazonaws.com/rewepalazamiso/62518607774.pdf
    • http://sixeres.epizy.com/27233726599.pdf
    • https://s3.amazonaws.com/lumixi/34564762068.pdf
    • http://semewovutiwo.rf.gd/hp_officejet_4500_print_cartridge_problem_tri-color.pdf
    • https://s3.amazonaws.com/bejokazemur/game_blade_and_soul_vietnam.pdf
    • https://s3.amazonaws.com/datarofapakil/google_translate_app_for_iphone.pdf
    • https://s3.amazonaws.com/zopenave/beacon_health_options_claim_form_address.pdf
    • https://s3.amazonaws.com/moduxanakuri/jack_and_the_beanstalk_short_story_moral_lesson.pdf
    • https://s3.amazonaws.com/nutanigonu/delegation_poker_cards.pdf
    • https://s3.amazonaws.com/navoburarovada/91336411114.pdf
    • https://s3.amazonaws.com/zomuzigo/derbyshire_police_report_a_crime_online.pdf
    • http://jexonuwunow.epizy.com/nokia_asha_video_er.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9db.bin
4d64ee7c99d4c44062d1bb619a9d214f838c15f40af2e93a0c2398b1d7464b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 5612 bytes
font_01_sfnt_off0000fd11.bin
40698e250bd3e4fc73d26f62653acf13fc433f5aec481bca4dae6759179ed8fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 11416 bytes

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