Malicious PDF — malware analysis report

Static analysis result for SHA-256 8901c92a37b40c49…

MALICIOUS

PDF

71.1 KB Created: 2021-04-30 00:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 413b9b81289f127183d343236e6d060f SHA-1: 74eefd937f2464b390df0389e55a76002e96efff SHA-256: 8901c92a37b40c491a2563415a10709c2a87b41073932447e9d9f22b7592081b
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 0.9997

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://pelibifir.ru/strik?utm_term=simple+compound+and+complex+sentences+questions+and+answers+pdf PDF link annotation
    • http://megahit.space/bakudisusipejjeb9u.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/bP4iiVl/subway_restaurants_franchise_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/Q8jfz3Z/photo_video_editor_with_music_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/heh5UUt/smooth_action_cam_alternative.pdfIn PDF document text
    • http://idealica-ufficiale.site/libelenetajonj1nf.pdfIn PDF document text
    • http://itasda.online/188007389647k177.pdfIn PDF document text
    • http://filemarker.store/the_3_body_problem_audiobook1orq9.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/gjib9fF/xojigabadesaja.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/hhQdfjh/woxakubabezefaxugatajasop.pdfIn PDF document text
    • http://pipvip.ru/kia_cerato_2020_owners_manualdcz8s.pdfIn PDF document text
    • http://winoorama.fun/stihl_string_trimmer_head_partsnxl3s.pdfIn PDF document text
    • http://trenolgia.buzz/tefozikudadeirhmr.pdfIn PDF document text
    • https://cdn.sqhk.co/rofezurit/cPifLjd/pdf_search_engine_drive.pdfIn PDF document text
    • http://zubiki.top/kanawha_county_school_bus_schedule_2020dhr74.pdfIn PDF document text
    • http://musc-media.xyz/panasonic_cordless_phones_answering_machine_remote_access3dxn5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/prezi_presentation_software_crack.pdfIn PDF document text
    • http://tefinavi.epizy.com/bhakti_dj_song_3gp.pdfIn PDF document text
    • http://riwugenesujo.epizy.com/49021988876.pdfIn PDF document text
    • http://kigejumepit.rf.gd/business_name_registration_form_for_partnership.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/31886803596.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_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 5692 bytes
SHA-256: 6669136ca65e9dd7354197b5a0453f4703e3292753aa99b6f63348071cf593b6
font_01_sfnt_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 10460 bytes
SHA-256: 26ac10577cb04370985542816d121b37c71909b700f8cb149fb14f2631b7a320