Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1a2fb3fef89bc4…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 03:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d8c972896fac2d7bf7613c17eaf1f06 SHA-1: d2b2ce1221464bdff33936ba7f0395c23529968c SHA-256: ed1a2fb3fef89bc4731bca77b9b2dbf43682801298488263a314206c2edf250d
134 Risk Score

Malware Insights

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

The file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a 'download button' lure suggests an attempt to trick the user into downloading a secondary payload. The numerous embedded URLs, many pointing to suspicious domains, further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zhbiotech.com/CKEdit/upload/files/laxijivajumofe.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/91723911180.pdf
    • https://mb-classic-service.de/userfiles/file/980846080.pdf
    • https://flardochform.se/userfiles/file/nesokoxo.pdf
    • http://kes.org/upload/editor/files/vodelapipobewomujip.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/tomativaxobufuxuzuxekum.pdf
    • http://aihyang.com/userfiles/file/13721376356.pdf
    • https://planningpvedh.nl/ckfinder/userfiles/files/80119262553.pdf
    • http://domgr11.ru/uploads/files/fomeguvup.pdf
    • https://mahanakhon.pacedev.com/ckupload/files/popumimuwavevijiker.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161444419bc2f4---33459044032.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/xuzajofezetikedaz.pdf
    • https://sushixusa.com/userfiles/files/raragunodesijateriwomo.pdf
    • http://saga.diamonds/uploads/ckfinder/files/podedolefafamejite.pdf
    • https://escritacontabilidade.net/fotos/news/file/genojudazevo.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/58669303313.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b0f3dbfcd---runuge.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1117213051613eeccbefde1.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/27809676751.pdf
    • http://naturalfurnish.com/userfiles/file/85714403804.pdf
    • http://advairtech.eu/assets/userfiles/file/fetiwetanifiv.pdf
    • https://cnn-logistics.com/asset/files/jagepijowezapurawilale.pdf
    • http://mosvag.ru/img/lib/file/21599396849.pdf
    • http://trustycctv.com/ckfinder/userfiles/files/kamoxufa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=nanny+mania+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22d.bin
d4abea3be28133c0518735fa96ee4ca47b05d596b37f6ec1facfbe2d1d9bf13c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 9932 bytes
font_01_sfnt_off0000e807.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 16792 bytes
font_02_sfnt_off00010019.bin
1ec4b7631d521c05ca71df6f34f59b7cdbb99558d9b09b9982e31e01d06ecd3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 17912 bytes

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