Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00efa668ca6a758…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 17:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4239552754d047886667b445ff35e38e SHA-1: 58ce1008691e60f968a11cebc004ab21375839f3 SHA-256: d00efa668ca6a75848a26829b83964d0bf930b0a01607e023a7ef886aef7f2d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's used to redirect users to potentially malicious sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=launcher+redmi+note+9 PDF link annotation
    • http://cainghienbinhduong.com/uploads/userfiles/file/dedilujorewipiriwosako.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/50723409598.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woduja.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/zegobubabevax.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bee81eca9---jutubipulofufuwuxedaman.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/gidazeziwofimagewawaf.pdfIn PDF document text
    • https://adikkedua.com/contents/files/jedek.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/86437278645.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/neruv.pdfIn PDF document text
    • http://df-2.de/images/daten/file/19348199186.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/73682651107.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/82187623284.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/safudevudokab.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/76304189630.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/264828979ee1276ede51aecdc86a45fb/vopirete.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/nasazerajawokazalegugeg.pdfIn PDF document text
    • http://unibox.lv/files/text/mujagepen.pdfIn PDF document text
    • http://storemisr.com/uploads/files/memex.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zulegigiberolaluwo.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/38756501218.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/81082313098.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/wipofidetiwojex.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/zefupewulim.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_off0000be37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE37 10648 bytes
SHA-256: 934b7ca77500c07f25d5d0f2c87d8415d52ed7843ad934b67bd2462524821908
font_01_sfnt_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 16880 bytes
SHA-256: 7140d6006871ccb3e67d151566b00a52afb1fab331e1c001cfed6c32142ea508