Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e0da212e8276fd…

MALICIOUS

PDF

88.4 KB Created: 2021-09-08 22:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e2efe20bfc691b14889202d31ad41e0 SHA-1: 3413400e06377d6db04a9418e69885775e7a8bff SHA-256: 42e0da212e8276fdb779fba5ae2e867bf13ae4d10de88690eb462c318f4ba052
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://akemi.ro/hirek/file/fipatefuserowud.pdf In PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/babipofi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9049cf7a---nijoso.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/19704189932.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/47590541152.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/5134303689.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/61337682823.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mvrh41k0bj5qh4k6hivl5ovcl4/lefibaj.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/vapofogope.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/xinozabixinuk.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/62995768013.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/zusawuwizurutodar.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/zujem.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/sejoda.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/filanakegereja.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/96379595258.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/pivuvijasuf.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/zokememadaf.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/62048067201.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/56969669569.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/59569220673.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/figeki.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/nagude.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/51721669895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+note+8+price+in+ukPDF 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_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 10744 bytes
SHA-256: 8e15e7926c3aff767936e1b51503fd732e3042e1dd30fa7dd1724421ed286827
font_01_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F26 19816 bytes
SHA-256: 467f69db993b3f8db9f0c0f026fc0b365d88c984b6cc562cbc98e35128a32fd7