Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1f9c8b6adb5993…

MALICIOUS

PDF

79.7 KB Created: 2021-03-18 01:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a9368f1fd31d4cfb5cfcc2034ca254d SHA-1: ba623f62f08b4e2e0705ec66967334e5b3d79ede SHA-256: cb1f9c8b6adb59936694ae8d03036d86e77c19748473f44962aba0458589ad75
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various external PDF files and a primary URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, contains a URL that mirrors the primary malicious link, suggesting a lure to a site offering 'jeet kune do online training free' to disguise malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=jeet+kune+do+online+training+free
    • https://foxesusonixuna.weebly.com/uploads/1/3/5/2/135298742/e7ea77f.pdf
    • https://tomosuboma.weebly.com/uploads/1/3/5/3/135382902/rafobamedagodos-fizeg-sotijab.pdf
    • http://wuwubaga.22web.org/chinnari_chinnari_chiluka_ringtone_free.pdf
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/3471a.pdf
    • https://cdn.sqhk.co/govonesed/NkhgC9N/76369771176.pdf
    • https://cdn.sqhk.co/buxifuludo/eieierK/zitiwefabaze.pdf
    • https://cdn.sqhk.co/xejoverol/gfihc65/rapejadilugorutibaka.pdf
    • https://cdn.sqhk.co/rivotoxupow/Schb5Di/party_mixer_dj_player_app_free_download.pdf
    • https://cdn.sqhk.co/kamavedes/iigLkhg/biomedical_materials.pdf
    • https://cdn.sqhk.co/wusoxopejezo/eXhbgeP/microsoft_powerpoint_templates_online_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f414df59-d0c5-412c-8277-160bd92acc6e.filesusr.com/ugd/055bb3_192cbe7810a9497a878f86465c06a6d1.pdf?index=true
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_f5821e0738574b8a8509e05c6a260583.pdf?index=true
    • http://pitupeg.epizy.com/banivarumomijavinusunoz.pdf
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_7952722bd32d43959890dd1bd795afd0.pdf?index=true
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_b033e9be6e59405c9132f4ca72c23c3e.pdf?index=true
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_4a88d93c8b0146bdb60416cf0b622d8d.pdf?index=true
    • http://xadamodovupeniz.rf.gd/kevazatakudukaposejobag.pdf
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_27c3a2437c654141a0bea0842115861b.pdf?index=true
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_f6002f9b1f90428894ea4d958b590d65.pdf?index=true
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_b2d57d02007b40e198fe896444e272e7.pdf?index=true
    • http://wasaxotudulolo.epizy.com/how_to_fix_a_dehumidifier.pdf
    • http://bavolonetokibip.rf.gd/mental_health_stigma_facts.pdf
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_a3bb2c5cff9649b0b1c039f97985d44b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f4.bin
58834c6111ceeadd9da9224a69dfeff5eeda44b71c41caf74017f03656382462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 4948 bytes
font_01_sfnt_off000109e3.bin
06bd84c3902da183799b6bc7dc85618f66ef66df14886badccf1e0da488bb18b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 11528 bytes

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