Malicious PDF — malware analysis report

Static analysis result for SHA-256 76110418381b54c1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 01:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2820cc7c378e881a2cb8cefb3011726a SHA-1: b8f1b95dd26f4469af524932a3946fb73780822b SHA-256: 76110418381b54c1b169ad327cb323fc628b827f2ce409f0d471191f6bedd722
206 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It employs social engineering tactics, specifically a lure to install a browser extension or update, and also instructs the user to interact with clipboard content in a shell context. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://sieuthimaycafe.vn/uploads/file/dejazo.pdf In PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210901151515.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/kosudabapugazevezudagutod.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/tifuraraledopelobafuronej.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/zobitufirijuposurafat.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/palotixuduxej.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vrdvd6nj3gno19nclu5skcsas0/44908070769.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/53355908811.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/jodigesikipuderababaw.pdfIn PDF document text
    • https://citytrafik.nu/images/file/48252780.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161379551e0365---99917539105.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gesozerevizutut.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/77637346024.pdfIn PDF document text
    • http://superbarter.sk/media/file/bumutewegezudizixipelibox.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/govumefadisujejezelavuvot.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/zomimerexetitikewe.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/kubodasase.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/pufinumisubegososesukade.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/kopabusefapasi.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/85695638299.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/valogibuwixinepuzox.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/68520866231.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/95967339569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=shortcut+to+close+chromePDF 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_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 10312 bytes
SHA-256: 5f63a8909331cfb7db86243f6f38b9f0608b08bb5427234cafe85950c89d4c5b
font_01_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 18872 bytes
SHA-256: 83f13ae1efbb7dfce44dac2ba73d933cc4f998df915037dd51a493ceae5c4342