Malicious PDF — malware analysis report

Static analysis result for SHA-256 282cc8639432644a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 16:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afeb035d832f6e4e08d2d44a1984cc78 SHA-1: e0779cd590470477402d477af887041ce881236b SHA-256: 282cc8639432644ac860a8eb4399f37836e1bbea5ce77820d129651a20773014
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting it functions as a link farm. The 'SE_LOLBIN_RUN_COMMAND' heuristic firing further suggests the document may attempt to execute commands, possibly via embedded scripts or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://motodubai.com/uploaded_images/files/4248842019.pdf In PDF document text
    • http://hitecds.com/userfiles/file/pudol.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/12589907103.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/juwejojejaguwifarixemeva.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/41372318092.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kedejozafematewuni.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/bovolorasexomilejadapirom.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/68495814836.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/mogawavotivovetewama.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/22357787768.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210905145922.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/13050158472.pdfIn PDF document text
    • http://klpa.net/userData/board/file/63253404895.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161300b5d2766b---ridelifidusop.pdfIn PDF document text
    • http://qdcmd.com/data/files/50497527070.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/37715747006.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-7/20210907002604287519.pdfIn macro / runtime command snippet
    • https://zibarajabi.com/cache/fck_files/file/gowurojasimoruzozep.pdfIn macro / runtime command snippet
    • https://takarasushimn.com/userfiles/files/71933621721.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/jazufotop.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/kesuropo.pdfIn PDF document text
    • http://matras-devison.com/upload/file/5405935999.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/71281226204.pdfIn PDF document text
    • http://tfh-filter.hu/_useIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=azure+certification+70-533+ebook+pdfPDF 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_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 11284 bytes
SHA-256: 86d6ec703abd7bc6ac0b8df922ec2dc7aa9ecc30a4e4872223f3d8867dc0d8f0
font_01_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 18652 bytes
SHA-256: 2184ce2a68598da1358810dc171bcab16183811ecc65f385160f505f1b927d15
font_02_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1