Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23b5aa6591983d8…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 10:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d09e26222ba141c643ffd30dcc775efc SHA-1: e54241b7beb507e5835d42495c4f11000f4744fa SHA-256: a23b5aa6591983d8b7ae9263cf4501450b51d677fc4088fd620d040e5c019d9f
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=mm+bookshelf+apk+download+for+pc PDF link annotation
    • https://feldmann-spedition.de/pics/userfiles/file/39787052089.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210921044727857.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/rebepufunaxuruxixijusano.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/tedajoninotumosugugesuzep.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/fisosewamewaviziram.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/lewadununotetofevekitu.pdfIn PDF document text
    • http://pedraferro.com/files/files/93240559897.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/5691777990.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/modupuvagi.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/teluzuwavo.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/jilafuloje.pdfIn PDF document text
    • http://poultech.net/d/files/39382107924.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/96431565223.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/xubumelufifuzize.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/vixuremulakosula.pdfIn PDF document text
    • http://belean.pl/userfiles/file/4832551383.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/gudosadove.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/vanesuzonidovase.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/karabiware.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/28114779456.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/nudagitip.pdfIn PDF document text
    • http://exosushi.com/uploads/files/baxox.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/kivitafofufuvaworeg.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_off0000ae12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 16536 bytes
SHA-256: 088bbb8b09ddc185165b9153ff92ee20a6104a77c95d1c40938a577f1e693b7b
font_02_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 11004 bytes
SHA-256: 5e7d56511b54a1100d5ddee647b1094118e2945dcbdc77de32a5393e493959df

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