Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f5edd12e55193d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 03:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d197146e7780cddca3a6314432df9ac1 SHA-1: aa345d52102ad4644ce8aa0b2e8d5460a5c7bfc9 SHA-256: c7f5edd12e55193d303eead1bcc357d1743b8c75c1fd9655377117ed65366bb6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous embedded URLs, many pointing to suspicious PDF files, suggests a phishing or malware distribution scheme. The PDF itself appears to be a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://theelementrama9.com/userfiles/files/wasajabamoxumumadopiko.pdf In PDF document text
    • https://raselapp.com/userfiles/file/98567002192.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/gizizaxuburexemim.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/peveburojezabozolotimes.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/mexodukuzazutabewebubimud.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/sipovepexeduxazorosuril.pdfIn PDF document text
    • http://master-br.ru/img/file/42507397770.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/5285117701.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/17034306132.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/newobosukunujunav.pdfIn PDF document text
    • https://ibericadearmerias.com/file/15362905126.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/dolakunipomesirubasalibiw.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/xawepikivogixesefitinagi.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/11280494051.pdfIn PDF document text
    • https://onlinendttraining.com/files/lifizemigarimulalafaw.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8b09d4ac1---nipalilozusazoxune.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161360d61761bd---30615274025.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/ravituboz.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/vagosuj.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/tozuzifanufezitoralavuvo.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/pufumixifixej.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pusomifupujemesukepitisa.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/dipakenetulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+see+if+someone+visits+your+instagram+pagePDF 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_off0000d0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CA 16932 bytes
SHA-256: eef236e2941d3f720d1ed1f5eca45614a70ed5f28f554b3579e964eb481f05d4
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 10968 bytes
SHA-256: 3fb307afd415dd299e68bd839f397778efa0afd8cfc3d50ba50f1a58076c392d