Malicious PDF — malware analysis report

Static analysis result for SHA-256 20406c29b82c8325…

MALICIOUS

PDF

75.5 KB Created: 2021-09-10 13:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8857356f0ac74acb897622fe65e21c65 SHA-1: 9341889f3ded96173f6ca9c5322382417cfa8712 SHA-256: 20406c29b82c8325330120ce467872283acb9a1280d2d7ccc13c215e4cbe7104
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous embedded URLs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://nwatchonline.info/userfiles/file/novajofavunuretuwumalo.pdf In PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/semirojukapefomudu.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/vuzizivefepawabud.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/76472978828.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/fefino.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/21423300864.pdfIn PDF document text
    • http://panteres.com/files/files/gisulawaxezonetoveruxaj.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/devikogaramaboxuwipod.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/vofekegipularoxunofab.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/81015767731.pdfIn PDF document text
    • http://pmke.cz/pictures/files/bafusawatitotawuvijagajoj.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/13451290540.pdfIn PDF document text
    • https://endobible.com/userfiles/file/50643518759.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f04f9e7b2c6ededb4bc5903892426d24/vedufotojeduzuvab.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/zejizorelepagoro.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/jederobodobenek.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/11767438672.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/59029816806.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/4701742050.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16134dac9af8c0---97143012923.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/80862778848.pdfIn PDF document text
    • http://benly-carson.com/product/files/limatamarajefasig.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/doxexokidojagut.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210904/file/16307251313717.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/xodinowave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cool+math+tower+defense+5PDF 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_off0000c42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 10776 bytes
SHA-256: fe8ca8768e5b58c11fb3bbe9faf599f72016e41de6492a115ed3671fa302d485
font_01_sfnt_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 16716 bytes
SHA-256: 139bdbbe33247380aab635e47868f06aa11d7b309f2261c705547f8661795883
font_02_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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