Malicious PDF — malware analysis report

Static analysis result for SHA-256 158ece44ac066c28…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 09:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c853e528facdba6d072b3cf0db4bb57 SHA-1: 079bf77bfb694a4e7a5f702e02b1b25ebb8438a8 SHA-256: 158ece44ac066c286fb1d158e3db90d2f851df3afba8e606761938f2dbec7cd9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests an attempt to execute commands, likely via embedded scripts, to facilitate malicious activity. The presence of multiple external URIs and the link farm heuristic indicate a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://chokysitohang.com/Uploads/userfiles/files/33606329190.pdf In PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/38847702421.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/58354595021.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/wodipowat.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395909bc5dd---2722445909.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/xavolupudirotere.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161390336a8bdf---46174652008.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202192652164014.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/11408349711.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/botufixeleneneniguro.pdfIn PDF document text
    • http://climtech.com/files/files/dujenuzezit.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/56611789890.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/godafetepiforegari.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/4848838132.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/44705833681.pdfIn PDF document text
    • http://gensugroup.com/upload/files/datepago.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/36588725328.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/6985648747.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/sarig.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/vifitegerajadi.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/6373608375.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/lizusuvo.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/banop.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/69123331827.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/difapotut.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/gezoperobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+download+play+store+app+in+pc+windows+7PDF 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_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 19192 bytes
SHA-256: 58c62dec895aaf3149f2318e9ec6913aeef30af9da35a9044f56fbfdbd4f891c
font_01_sfnt_off0001109a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B1 10748 bytes
SHA-256: e6fe28d0a8b2540aa049bff734037ae407a6b36b4f23a2688dd947e6a364f800