Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f62dcd7c9a3f5e3…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 13:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3252cf42f7b7d8299ea6b6b3d2bbe763 SHA-1: b08e2e018774ca0b128719ceefe98c63fdc15b1c SHA-256: 2f62dcd7c9a3f5e3c790d7f151b2063221508c907e88a88e10a8d838cd419061
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous external URIs, many pointing to PDF files on distinct domains, suggests a link farm designed for SEO manipulation or to host further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://toolsatool.com/userfiles/files/xewevelipelulagum.pdf In PDF document text
    • http://findmecakes.com/userfiles/files/wadesopadarixejasinoza.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/24010710377.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b72ee6e207---mirizarog.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/mivarukewejibux.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/40253836163.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/26140609364.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210914002824.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/48331289008.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/dopiketuxenodomofupituvu.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/70011338860.pdfIn PDF document text
    • http://rem-proekt.com/f/file/depexikoxudito.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/komivazibaxedi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wogirugilifu.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/vurokise.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/43034908493.pdfIn PDF document text
    • https://comfort8889.com/upload/files/melulowavumomerodo.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/72467088311.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/87684117373.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/36051198788.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/mewezoziludajexusis.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/zirokoxej.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210913085828.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/jenezamatabiwix.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210906045730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=korean+alphabet+order+with+english+translationPDF link annotation
    • 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_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 10888 bytes
SHA-256: 5a577fee85dccc289c702a9b2273452cebc0a628931640005470539154300948
font_01_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 17972 bytes
SHA-256: 1da825fea09e5bd60d31f2e48aaacc91a8cf57d08c9416c75a88c8d8744dcb54
font_02_sfnt_off00012f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1