Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ce04da6929331f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 08:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4d2b665d368a00c5aa9d03f58d60750a SHA-1: 5e6805014a32e049d2c6699f68fe1089e8efc2b6 SHA-256: d1ce04da6929331f40644d0f51b9e7cd4e91cfeb846cb47c264d2713985a4292
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many of which point to PDF files on potentially disposable domains, suggests this PDF is designed to lure users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=las+21+leyes+absolutamente+inquebrantables+del+dinero+brian+tracy PDF link annotation
    • http://njxinbell.com/upload/files/vemaxobijeb.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210918052652564.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/40817941119.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/68096073762.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/31851362290.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/jizijojumofogixa.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/moriv.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/82489338232.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/xevafewi.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/4090526133.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/92294254349.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332925117f3---21789057193.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/tuzusuxi.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/48838162782.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/rivujoleniraxopakesoxalu.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/48420408434.pdfIn PDF document text
    • http://stroi-sistema.ru/img/12767377361.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/86059532627.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/keduzuzul.pdfIn PDF document text
    • https://architektor.ru/uploads/file/19065465388.pdfIn PDF document text
    • https://verner.lt/images/files/20041416812.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/35495051071.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/lezep.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/xoloresovoxes.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_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 18628 bytes
SHA-256: baa42889af560779da3c84f70e06301e4d87e0860d4a1130e547ec72126e6582
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 11160 bytes
SHA-256: d9f5c0995ffe7cfd88e06644af6f168e7cb0e305698fe63855aea470e8a81fe2

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