Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8ce2bb9946073e…

MALICIOUS

PDF

89.9 KB Created: 2021-09-18 13:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4534227bfb17dfeb71e796d7ae46d22e SHA-1: 5fa87ea51146db642abb726104fb7d64b5fe1297 SHA-256: 2d8ce2bb9946073e1677a9aa4f8f2aafaf89269c530fd626fd993f8225def1a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krisoc.ru/uplcv?utm_term=use+phone+as+mic+for+pc PDF link annotation
    • http://aylincinarli.com/fckfiles/file/5929608958.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8afe4100---wovapodel.pdfIn PDF document text
    • https://bem-sa.com/img/file/piwabejur.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/90551212612.pdfIn PDF document text
    • http://ropesadventure.com/d/files/70860340652.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/gagewa.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vosusugibiji.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/90486525374.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/63127816403.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/21512108128.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/sosovasozoj.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/73111602188.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/debalorikawolizelinigex.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/parenik.pdfIn PDF document text
    • http://93564497.com/userfiles/94170897571.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/lebapilenaborodewera.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/dirulugipez.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/92580815910.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/21614829666.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/10613607554.pdfIn PDF document text
    • https://emmaushuis.org/pages/42379384787.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/5832372149.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/gagitemoguzoridomifafax.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0a37a3ef9c96256db6901abd4ccde1df/21938930809.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_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 10608 bytes
SHA-256: 0198584f3c2fbbb9d3975da247869b2c04815c5f59c634fd9b632c0a3935548a
font_01_sfnt_off0001113f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113F 18664 bytes
SHA-256: e6a66d7e3b2920af2570ed869bc76e9a690d523e0e0713e0b3ca16fe5cd31a2b
font_02_sfnt_off000141cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1