Malicious PDF — malware analysis report

Static analysis result for SHA-256 029d397ec3f25605…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 05:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 511bd9d4312c8b6ab7945cbf22a3c662 SHA-1: 01d8e0ae55b84457fe23be380058e8b5da7080c0 SHA-256: 029d397ec3f25605570ee23d72c603d49c6bb048eca25f30b96177b575cb087c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=the+day+after+tomorrow+full+movie+openload PDF link annotation
    • https://combrooncom.com/contents/files/kavixe.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/83429551503.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/juzuvijewotexuxogixo.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210913225556.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/55031271844.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/7248067980.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f61b947e6196d47b75c6ca29baa995c9/sodax.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/93247281526.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613661316346a---38665605712.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/fetolonukutotobil.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/88678163890.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/rosoxali.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161436d02b3945---85392254540.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/36250990177.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/vifiveb.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/12/file/20210912_144039_148.pdfIn PDF document text
    • http://punaide.com/userfiles/files/72182882246.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/20332198740.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/6117740898.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/94974304943.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210910_E4A87540291466E8.pdfIn PDF document text
    • http://retrofotr.cz/files/file/82447611840.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/51485407673.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_off0000be9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 10924 bytes
SHA-256: d76e445eceb21f36c626ca90d12219ed71fa80ef73edcc0b3e805de2c1c25b16
font_02_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 17584 bytes
SHA-256: 6de694c51b37f333a8cc06979d4c1bf7979867cfea17e84fe4520ed2c1ba3b28

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