Malicious PDF — malware analysis report

Static analysis result for SHA-256 986904ed690a8203…

MALICIOUS

PDF

77.7 KB Created: 2021-02-26 01:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 101b4770363de25e81446d5bd96c62a8 SHA-1: 76b714f1a7e994eb6ab85ed204650feed9ee519e SHA-256: 986904ed690a820365a3339d34e2223950c2020e703110c55b0bf949c5e98e4b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many hosted on disposable domains, suggesting a phishing or link-farming scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=what+is+the+bolt+pattern+on+a+2000+jeep+grand+cherokee In PDF document text
    • https://cdn.sqhk.co/tezizejaropu/dAlIYZQ/bullet_time_effect_insta360_one_x.pdfIn PDF document text
    • http://mx50off.pro/485868479424hy1b.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/do_xbox_360_remotes_work_on_xbox_1.pdfIn PDF document text
    • http://kieverts.xyz/3748255081382wy7.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/jjhfZSW/58667118901.pdfIn PDF document text
    • http://revenularozudo.66ghz.com/simple_admin_panel_bootstrap_template_free.pdfIn PDF document text
    • http://jijexuvekenim.iblogger.org/pugusovogu.pdfIn PDF document text
    • http://demask.space/cmos_analog_circuit_design_allen_holberg_3rd_edition952zo.pdfIn PDF document text
    • http://it50save.info/what_defines_a_dystopian_novelfk65q.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/how_to_change_day_in_casio_g_shock.pdfIn PDF document text
    • http://xaninivinekeni.iblogger.org/cant_enable_web_services_on_hp_printer.pdfIn PDF document text
    • http://zexixojusikor.iblogger.org/64441665790.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/star_wars_galaxy_of_adventures_ahsoka_tano_figure.pdfIn PDF document text
    • http://lusejifunod.22web.org/can_you_use_a_garage_heater_in_a_house.pdfIn PDF document text
    • https://cdn.sqhk.co/vowobupubuze/pKjizly/cute_love_romantic_ringtones_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kavibajegis.onlinewebshop.net/aasl_standards_framework.pdfIn PDF document text
    • http://duzebufulumaw.epizy.com/rcog_guideline_gestational_trophoblastic_disease.pdfIn PDF document text
    • http://tumofif.rf.gd/60291345888.pdfIn PDF document text
    • http://zomatur.epizy.com/povasofonifituwirajidida.pdfIn PDF document text
    • http://nenenadixipuso.rf.gd/zudex.pdfIn PDF document text
    • http://witoluteg.epizy.com/carl_sagan_cosmos_episode_10.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/88891512348.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 5692 bytes
SHA-256: dd627ace2fb29b492bb12c66173b4c2f533a4b261bff52d93483bb12e1186fea
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 10288 bytes
SHA-256: 2dbdb9f20f4f844be7dfc26ed0a2edf583bccbebb5c16c1759c1c271da905916
font_02_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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