Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a7da8c9ad53823…

MALICIOUS

PDF

66.7 KB Created: 2021-03-30 10:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 85054fae2447d1038c7beb9fcc51e9a2 SHA-1: b37502a24692743a2565150ed72facbe7334d492 SHA-256: 97a7da8c9ad53823e5a2ce4697c7e5af85ccfaa829bd7ed7ad8b995761dc2b82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 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 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://golowaki.ru/wix?keyword=western+mailboxes+for+sale PDF link annotation
    • http://nufudoze.getenjoyment.net/vexeledenulanepaloti.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/hmjaaAr/gtr_4k_wallpaper_download.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/mcsa_microsoft_windows_10_study_guide_exam_70-697.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/idZJgdk/detective_baldy_alien_invasion_level_3.pdfIn PDF document text
    • http://xijivedijimidip.mygamesonline.org/birogorobugagiwozu.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/megjDYg/cbse_class_9_maths_syllabus_2020-_21_deleted.pdfIn PDF document text
    • https://cdn.sqhk.co/pulovafafita/cAiejb9/2048_classic_legend.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/bamboozled_by_the_ces_letter.pdfIn PDF document text
    • https://cdn.sqhk.co/kijowevo/hhhejcF/why_does_phospholipids_form_bilayers.pdfIn PDF document text
    • http://jobopenufa.iblogger.org/auto_body_repair_technology_4th_edition.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/nelegokitepigu.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/relaxation_techniques_for_stress_relief.pdfIn PDF document text
    • https://cdn.sqhk.co/nevenupixe/9Ghjt9r/sample_auto_insurance_policy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xasejumav.onlinewebshop.net/barevojarajasabamitogeto.pdfIn PDF document text
    • http://mimodiko.epizy.com/achtergrond_kleur_word_naar.pdfIn PDF document text
    • http://zijurape.atwebpages.com/wireless_cctv_camera_installation_guide.pdfIn PDF document text
    • http://kowelakava.rf.gd/high_ankle_sprain_rehab_protocol.pdfIn PDF document text
    • http://jijulek.rf.gd/animal_4d_cards_free.pdfIn PDF document text
    • http://muvamubas.atwebpages.com/manual_cade_simu_v3.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_off0000c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 5136 bytes
SHA-256: 98bc4080834182ccbc3db35ea252eeeffd3a523807e8a3a357e61be1d09c5516
font_01_sfnt_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 9772 bytes
SHA-256: 084dc02739b4d13e9de2aaf88bb07707ef95ed6e885193dac556e3150782aa44

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