Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f570a943b2c80a4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 23:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e6e6363e31ecd2141d792d241dee4ef SHA-1: 37c20151fcd7e05792fae4f9a4c467697b2a9775 SHA-256: 8f570a943b2c80a4f3eb89e0eedde85492248862f96c3ca4684c4af66ff9bd01
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to obscure the true destination. ClamAV and ML classifiers also flagged this sample as malicious, suggesting it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://copperscraphandlers.com/ckfinder/userfiles/files/68984930558.pdf In PDF document text
    • http://pokemom2.com/uploads/files/73933556230.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fcb63b600---kexagugepikajitasumo.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/lolajedejinu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/pomudogunoz.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/luzajopoxumeviwadis.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/tagexigetaja.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/2731783022.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/rimutodut.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/95947663662.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/67416830642.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/jokiledigavivogibum.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/69892999918.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/wakemalagitibib.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/73525998385.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/linez.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/47377070353.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/5456727346.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/zosumu.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/33282416403.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/81555312964.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/59676779504.pdfIn PDF document text
    • http://merwepizza.com/upload/file/20280617878.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210919014810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=acceptance+letter+for+teaching+jobPDF link annotation
    • 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://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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 10844 bytes
SHA-256: b96a7237c3a3a4b64da951795c6d039aa9200d5988bf236898abc1421673b632
font_02_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 17644 bytes
SHA-256: 01cc1af7d75d2d3088675a8089a7d413525b28270ed62d865ba2734bbed761da

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