Malicious PDF — malware analysis report

Static analysis result for SHA-256 611cdb75d448877d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 22:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39d4c1b66dad3c59936f5a7f8609cd9b SHA-1: 43f210da53622c2e8ee8a38def65edc6b6787459 SHA-256: 611cdb75d448877d7ca81f28fd7f6170d048541a0db175bbe4c40f1c99e34122
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document may attempt to trick users into executing commands, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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
  • 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://rent-lease-no1.com/userfiles/file/20210918153311.pdf In PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/74781903719.pdfIn PDF document text
    • http://mq-water.net/upload/vimufuwozed.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091012590376.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/14508951775.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/powufajelumin.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/popolipef.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/bipalarojev.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/kusuvamotejivipekifabiro.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/fimox.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/vizawisamu.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/tafelirixifilura.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/tibopekobib.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210915154424.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210918171335.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0a9608e14ae66e58112ffef90ab7a8bc/42883139696.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/zudawuxuvob.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/zurugoparidin.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/solumazorotipegexiloluf.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/92277165996.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210903_8D82D1AC1B19726F.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/dawifevaroben.pdfIn PDF document text
    • https://anup.bo/images/files/jevofilolonadobuboje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=thondimuthalum+driksakshiyum+torrent+downloadPDF 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_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 18408 bytes
SHA-256: 7d2bcfd919d8a3b1251931b246317da4b3dc41fc1d34952139c3c563029e3f6d
font_01_sfnt_off00010fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F2 10868 bytes
SHA-256: 309bde6368583cde364bc062209af7fa0ea6c1e94e14f8c44478304c6192fc5f