Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ca9ef1418eb184…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 08:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f714469d56d9fc56674d45edf6137f1b SHA-1: a86c122dd8cc9650d2d18235d3a41b9ac77e7c81 SHA-256: 99ca9ef1418eb1848a8eb148bbd4adfcc5a6b42be83dba282fee4f94267b2ef0
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The PDF structure itself is also noted as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://tentimesneedlehill.com/UPFILE/userfiles/files/95177242677.pdf In PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/38908275926.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49250664956.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/ximezumatijos.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/81603452168.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/dawilowovaxesadibirebalez.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/vubomazoxuxasiruturu.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/sifajejepamo.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/ropoxekedowulemura.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/xofuvutopedujudakenonima.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/mabowogiruzumumu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e06ed52ec---josozuluxudet.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/13506057900.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/rijafivotojotat.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/matiripejomudidete.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/8498999255.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/97491264208.pdfIn PDF document text
    • http://yanartextil.com/firma/files/zegifozomasizimen.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/70109879629.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zodazugosozorikawigabalu.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/kunajuxemibowesekukeridu.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/dozomafixuxuzuvote.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/64659508710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mac+extreme+iptv+apkPDF 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_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 18508 bytes
SHA-256: 52df997e12916a5ec973bc8b9c80091025913df8c098cbc7f2e18009688a6285
font_01_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 10352 bytes
SHA-256: ba21026a40717a8ae8179be52d7d585f831fb724fe4ffd1045fab0cc16eb2be3