Malicious PDF — malware analysis report

Static analysis result for SHA-256 c508e36dfe582623…

MALICIOUS

PDF

102.8 KB Created: 2021-03-03 08:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3334e7465bd1546023d7418087d6677b SHA-1: 23fea219f2f61bcf06d7da1499a1fcf8856716e2 SHA-256: c508e36dfe5826238aac652585d39ab81c3e5b26125f06fa5226918b66bae521
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the link farm heuristic point towards an attempt to redirect users to malicious content.

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://midufefew.ru/award?keyword=computational+physics+jobs+salary PDF link annotation
    • http://mynasert.online/fenoxu3puzu.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/how_to_write_service_book_in_hindi.pdfIn PDF document text
    • http://idealicaufficiale.website/percy_jackson_40j9cx.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/el_principe_de_la_niebla_resumen_capitulo_11.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/38131200578.pdfIn PDF document text
    • http://kanshoper.site/838126717030863z.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/massey_ferguson_3545_decals.pdfIn PDF document text
    • http://xovuwowim.mypressonline.com/how_to_heat_up_olive_garden_baked_ziti.pdfIn PDF document text
    • http://lbaranaydin.com/star_trek_discovery_season_3_episode_12_recapai1uy.pdfIn PDF document text
    • http://lg-copyrightforms.com/larabibikegumor44vz1.pdfIn PDF document text
    • http://redirunna.xyz/how_to_clean_flame_rod_on_rheem_tankless_water_heaterwezed.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/94657913178.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/fairy_tail_anime_characters_female.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/watepi.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/creative_design_websites_templates.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_off00013739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13739 5396 bytes
SHA-256: fd06d395599c8585cea26a8daa57b3d8bf83f47b03ecd11774263e50107de675
font_01_sfnt_off00014965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14965 14852 bytes
SHA-256: b18d08baa69cce347422b882ab4a4c5e60bd9b0d32592da649f712fb98a4dd3c
font_02_sfnt_off0001789d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1789D 16256 bytes
SHA-256: beed6d5983fe10ce1d57bc0c6840ab9eaa976a508c394a1d3313b552cbfa2aa2

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