Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ba07121b2a46c7…

MALICIOUS

PDF

71.7 KB Created: 2021-09-11 23:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfa7117fd267b1abfc58070e02b580c3 SHA-1: 4186e7f4f476f0b23636712b1277f1ec6fc6cbfd SHA-256: d2ba07121b2a46c7132ccb1b48b7ad16db6bc3fd4d6d96013c98d6308794b59f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=123movies+footloose+1984 PDF link annotation
    • http://ordinate-ltd.com/file_media/file_image/file/77021881343.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/87831070491.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/jolejawawujuretamusuk.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/vowefinutuxanazu.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/bomezulomonepobebavujito.pdfIn PDF document text
    • http://mq-water.net/upload/lobidigojapewafibusilunab.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gipid.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/52794418209.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/18104440612.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/golebodigoweti.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vutarefife.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/sizovamisupumaberor.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/72561391710.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/pumefumubakam.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/netafegixubeba.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3c4692c3---kamatitiremopakuxeda.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/52757156316.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/79033695292.pdfIn PDF document text
    • https://cargotavio.ru/files/file/97297995577.pdfIn PDF document text
    • http://kvrhousing.com/uploads/29882291059.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/xilibawevofabunasaba.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210905122437.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ad5a431e---nusinebikotoxad.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_off0000b725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB725 10776 bytes
SHA-256: 7b6add7e0706b75894930dc7d61d5c8ce0a9b3de21967d79685b0e2adbd27150
font_01_sfnt_off0000d026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 16128 bytes
SHA-256: 972ba70b70e8a9789e2745a1b7000fa334becc4fe9ae16b89aab3076c80e20ba

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