Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa876b75ca992e53…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 14:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4bf0b68608e6796af75d15b9ab45190e SHA-1: 0dffdcc44869880b289eb8f23ddb2c4b6d4b36ee SHA-256: fa876b75ca992e538407e76ce8633b6792dd3007707e31657f4c53270edacb7c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF that uses a remote-support tool lure, instructing the user to install or connect with such a tool. This is a high-risk tactic in unsolicited documents, suggesting an attempt to gain unauthorized access. The presence of multiple unknown URLs indicates potential payload delivery or C2 communication.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://fnathservices.com/upload/file/tisob.pdf In PDF document text
    • https://lotteppta.net/beta/assets/file/pibijivipagefububub.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/lapebamorajukipegup.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/duvaduwapokiwagik.pdfIn PDF document text
    • http://planbmedia.hu/files/letakemizegak.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/84220949664.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/jonipebifavaw.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/damurek.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/91947311244.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630863549.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/77195645781.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/nifibe.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/wejaxebilutolivugi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161343f0940679---defivenixowaza.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/vebanuvepamowusomo.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/jowewigiwofomak.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210905095613.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/nomutopixiwuvelowanek.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/65609941381.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135509e1b2ef---13512642134.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/pirifamodebolubevejux.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/betipivuzavubojewazo.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/jamaz.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/sowowobunixupowenujot.pdfIn PDF document text
    • https://koratspring.com/upload/file/99179477221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=remote+control+of+android+tablet+from+pcPDF 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_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 10796 bytes
SHA-256: cf859f059c26bf9b7f04a9ad5aa0e78cc2dc69a60409290a08f9ad2e87a6e8f0
font_01_sfnt_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 17772 bytes
SHA-256: 63152a794fd7f5a4645eef5887cbe22321f6d7685cd19b21149464c3136cc26d
font_02_sfnt_off00011f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1