Malicious PDF — malware analysis report

Static analysis result for SHA-256 8143e1005ed20dd5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 05:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e4279c20fc83dc27f6d1d8d483611bf SHA-1: 9aca06c9056d9a948808c860e0dc31ebfcad64ff SHA-256: 8143e1005ed20dd51b451b3430409198c6ec46e6d4a6a33be2adddc1b14123ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of these links and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=starting+out+with+python+3rd+edition+solutions+pdf PDF link annotation
    • https://buonoantonio.it/userfiles/file/21385218646.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/8552012546.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c81a6f81---zawiguduraviwupademosop.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/mipifu.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/17452976517.pdfIn PDF document text
    • https://ebooksweb.net/files/file/vexataxezuberonujunodo.pdfIn PDF document text
    • https://vpmemorial.net/images/file/77199959020.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/91383637563.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/lepizaserajogasew.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sokudis.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/81269457513.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130836d81b84---bujifumil.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/pafore.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/faxevejetamogar.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/85187078186.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/8219220802.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/49817675147.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vopev.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/98682251846.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210905191358.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/69862518673.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/nirafowazupigupuv.pdfIn PDF document text
    • http://zeci.nl/im/image/notot.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://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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 11324 bytes
SHA-256: 150574617cd63b8c234bc0d7cbe239a1fa785c89aef1bf4ba1d05618c011a72b
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 18936 bytes
SHA-256: fc8847e8098ea7b92c6ebd6f2cf227fc4a6bbf1c1f0278444b34419ee58edb27

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