Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a68626905c45db…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 13:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 097d5df8b7aa35f09bc3f60de6082a33 SHA-1: d97d4af2dcb871bd073f11803fc6905052c2151b SHA-256: b5a68626905c45db892fef2479f9a50bbbfc07a005072d284c9b9d53ffbc2768
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the PDF is designed to redirect users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=loco+apk+download+latest+version PDF link annotation
    • http://zxpgw.com/userfiles/file/43650167992.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/60629963584.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/84590781686.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/dixeni.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/3619941348.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/65874706971.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/12544567764.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/wekuludipivalimefenetiba.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://szcftz.com/upload/81469248820.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/13149684138.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/dagumibizadiwosivez.pdfIn PDF document text
    • https://apra.pl/files/file/66282121952.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210906062732.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/95356131301.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161375175e1c86---5534329979.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/75182765282.pdfIn PDF document text
    • https://faceless.me/userfiles/files/68960451404.pdfIn PDF document text
    • https://limsurempat.com/contents/files/52867107645.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7532a5c8b5e5197469f9da7c75a77cba/guwevano.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/sasixufelafenewil.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/fominotewiwobujibubutawi.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/mirawexixodojitirujo.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_off0000d6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 10708 bytes
SHA-256: cbe17d611b2fb95bad33800442cf4e19942655b490311aad276070e5aa7ee9ae
font_01_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 17780 bytes
SHA-256: ab194be548a791fbd8f031d68d1df886bd51852f3b173af0aafd0b3711888bd9
font_02_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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