Malicious PDF — malware analysis report

Static analysis result for SHA-256 875f63e442a1f42a…

MALICIOUS

PDF

70.5 KB Created: 2021-03-14 07:35:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9c671537a042a4e86c9d962dbb71b0d2 SHA-1: c3a5a4b56d21006b3242c9511b0315c9a6d4e859 SHA-256: 875f63e442a1f42a48f0f1230082fbac463722d911f9c01fe7b8e236718306bc
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 0.9991

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://kuzutuzo.ru/123?utm_term=irregular+plural+worksheets+2nd+grade PDF link annotation
    • http://fitdieta.com/what_hedge_funds_really_do_downloadtimtr.pdfIn PDF document text
    • http://tiktokfrance.fun/how_it_going_best_answerijfgj.pdfIn PDF document text
    • http://runivofo.iblogger.org/re-_admission_form_at_tut.pdfIn PDF document text
    • http://wisecreditscore.info/tejusimaxogitvhy5.pdfIn PDF document text
    • http://kuxixel.iblogger.org/nukerejiva.pdfIn PDF document text
    • http://vovality.club/windows_7_shortcut_key_for_screenshot6fg04.pdfIn PDF document text
    • http://neyroskakalka.site/the_last_exorcism_part_ii_castqww30.pdfIn PDF document text
    • http://laxeded.iblogger.org/juderebo.pdfIn PDF document text
    • http://tomandbxof.site/fozureo18va.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_708fbc8e1a7e46f4b50f3b0329fcbb9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/buxakape.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_7ce6d6fb8b4446cf8d371321db20af46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/endocrine_system_ppt_template_free.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_979d423e72fc42f0aa3bceb4e696f2ef.pdf?index=trueIn PDF document text
    • http://vupafigimewex.rf.gd/minecraft_apk_pc_windows_7_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea8c381-8303-420c-9e4a-6139902b1ef2/xunidotukumuzamitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe3793f-8e9e-4189-94e2-065d7d27ebec/what_does_it_mean_if_key_is_stuck_in_ignition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862de719-3282-4fef-8d81-4e3bac140ff0/how_to_build_your_own_3d_printer_from_scratch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d1af66-357a-4176-8ca3-b3ce63a15d2b/53555424126.pdfIn PDF document text
    • http://mugofunuwutav.epizy.com/how_to_set_the_timer_on_a_malibu_lighting_transformer.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_cc2b764c39f14c8bbbefe43343eec4a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2702bc45-4e08-45c4-95fd-008282e04008/85439890673.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/how_to_develop_a_cycling_training_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/3rd_grade_associative_property_of_multiplication_worksheets.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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 5444 bytes
SHA-256: 78aa2412f6ad93fbcd2b9be43e4c07ceee152c98575aefff3f43b1f001a59e65
font_01_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 10088 bytes
SHA-256: 3b014b0b3f947aeb75f910e0ee512e7263bdfcb6b02c8d22fe29b24c565cd3be