Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3c9d1f21c88964…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 02:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 536f91ca68ca6ddf69975dfdae4a8b7e SHA-1: 0e3e3774654aa7fd2ff58cc000508e7aa8eff19a SHA-256: dd3c9d1f21c88964dd1e160d3bb306432aab32211869324fba70a522fd4a3179
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=how+to+run+a+record+label+pdf PDF link annotation
    • http://studiotecnicodavico.eu/userfiles/files/93285130312.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/gugosuseka.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/gugumufuxirevupo.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/genikemike.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/tigadetevam.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7eb574d1899bd63d574532fa4ab2c6a0/30356569611.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/24418699158.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/23502252428.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/698560539.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/45918860682.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425bf19d264---sukebisuv.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/19949261328.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/38095594249.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/43639242408.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109141449343982.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/24062918873.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/19101004432.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210916224730166412.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/kogozeramuterovagu.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/siwapuligusagudew.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/49772533905.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210923135530.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/74999496892.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/65721231122.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_off0000b06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC880 16352 bytes
SHA-256: ad444142144205f3b9c3c77be87586b94ab0b4751dcdba6e6f69efd7d2483936
font_02_sfnt_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 10668 bytes
SHA-256: 7686345fbb5c929df86ebd133b334f1bf9f9ac4f3d4acf39623575d5684f538e

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