Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ac9e0b359a9f9c…

MALICIOUS

PDF

80.1 KB Created: 2021-03-19 11:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4f194673a392b7e0f8f79eda38eeec20 SHA-1: b2628bd97b72b17a1927432bdf58df0e98a93190 SHA-256: 31ac9e0b359a9f9c0e876a93c3c43b6ef4af01106b90fcfe7e33805014f23e79
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=next+level+strength+al+kavadlo+pdf PDF link annotation
    • http://lishop.site/taotao_atv_reviewgxdwu.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/dell_p2415q_macbook_pro_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/bsjcjfN/codashop_free_fire_tournament.pdfIn PDF document text
    • http://nazhivy.net/375486566072b2sc.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/JAxMibx/lucky_block_minecraft_servers_cracked.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/cibPIxo/infection_control_certification_ny_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/gGijB0m/gefopenuzufemoruzopixo.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/81887668140.pdfIn PDF document text
    • https://cdn.sqhk.co/romekeka/eibChdL/jarubidesujiwuxobokamoze.pdfIn PDF document text
    • http://instapriz.site/libro_azul_a.a._descargar_gratisww1d7.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/icwgfLU/62807506349.pdfIn PDF document text
    • http://power-guard.shop/393842115850k9hc.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/christmas_carols_charles_dickens.pdfIn PDF document text
    • http://verenica.net/move_data_from_android_to_ios_appq70ev.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/chiicgj/prestonplayz_minecraft_skin_blue.pdfIn PDF document text
    • http://vomidujoma.scienceontheweb.net/what_is_the_purpose_of_the_bevel_on_a_needle_tip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusebirenox.myartsonline.com/prefix_and_suffixes_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552df7ed-d459-4fa9-bf17-e26dd55bea7a/what_is_included_in_the_black_card_membership_at_planet_fitness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d999ba-a271-4f83-adac-93745a04ff87/summary_act_3_scene_1_romeo_and_juliet.pdfIn PDF document text
    • http://danebusuji.onlinewebshop.net/power_electronics_objective_questions_and_answers.pdfIn PDF document text
    • http://sewujajapivix.onlinewebshop.net/html_tag_justify_text.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 5464 bytes
SHA-256: 71eb959b874b317f62054dd0c936ec9b7f8815c0275a47ffcb3711ac433aac08
font_01_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 11040 bytes
SHA-256: 5496005c8d1d62d03088841c16acba9971ca9a8af4836df53644178ddf4bf8cc
font_02_sfnt_off00011c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1C 16064 bytes
SHA-256: 2bad467a3639e7270d00e4d92b62c633bdf3fca121352097ea953ab0934ed0fd