Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb4768c470e829e…

MALICIOUS

PDF

73.3 KB Created: 2021-03-14 21:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 04c19dd089c62d8bb3ea6cfb4aaf851a SHA-1: 975d5208c42d2809df726fc32d397d21d31064f2 SHA-256: 0cb4768c470e829e1542071ad138ba0542da70696e7738467ec74976674fc3f8
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=area+of+composite+shapes+worksheet+pdf PDF link annotation
    • http://airned.ru/petedimubiremigikevakavaszbf6e.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/wadisarizud.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/dDtrBb2/tap_dig_my_museum_pickaxe.pdfIn PDF document text
    • http://carinsusa.info/aromaticity_in_benzenoid_and_non_benzenoid_compoundsrtpv3.pdfIn PDF document text
    • http://grigolia-studio.ru/gaggia_classic_pro_vs_rancilio_silvia_mkfvlh.pdfIn PDF document text
    • https://cdn.sqhk.co/mudebijutene/ibcs5Ei/mediamonkey_skins_location.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/fazog.pdfIn PDF document text
    • https://fiwibafufo.weebly.com/uploads/1/3/0/7/130774969/latisuxe.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/b3a3b990.pdfIn PDF document text
    • https://tajezutudod.weebly.com/uploads/1/3/1/3/131398094/4196833.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/rudelazifizuvo/nothing_but_the_blood_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/cursos_para_aprender_ingles_gratis_online.pdfIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_d41fc14d5d19407cbb6cf618e3399be9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/povodijirig/jologuteve.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/apokriewe_boeke.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/acorn_insurance_services_formby.pdfIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_ffb91402cc1f43b8bc1baaf93f06590f.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 6988 bytes
SHA-256: 5b36783917403d992df1ad315dc62e71ee1444b0ff74709393ea5136b870f828
font_01_sfnt_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 5508 bytes
SHA-256: 944ed20e7df03b0b9f3e921cff670c98a9291b3a815b78e7bacce8360594a04c
font_02_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 9940 bytes
SHA-256: 5d67950729712f9e591ec1737d86ef947a3e895e5be8a17166aa783e29188ec8

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