Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3f7463897c57fc…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 01:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d4f10243ca04849a5c8b0a989b73862 SHA-1: 6869b419c8014331699e034130fa378f0a9da466 SHA-256: fe3f7463897c57fc84a17c6b1412a8db2a7b7a58be49d374953259d9d50c5bb0
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to suspicious or unknown domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, and ClamAV detected it as Pdf.Phishing.Trojan. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614eab6e4e526---wamorubafekamefub.pdf In PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/soxuvu.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/43659125791.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/65763334604.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/nudopipuzabexalav.pdfIn PDF document text
    • http://aimic.com/userfiles/file/19886354290.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/duweka.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/88170506314.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/zapis.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/mezesejasibotisivodepup.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210906_3BF0C837B54742DE.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/86079404921.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/98143391397.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/kotimodaxawixixodirovu.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/7328007548.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/guwawuruwabig.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/febunajodukifik.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/kifavinonaboti.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/57431724445.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/2163051639.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/72386027313.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210917_D0AD64A98984C1A9.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff2c9b94a---darezipuwexerovin.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///58487414215.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/11944512160.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/14860368574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=netshare+no+root+tethering+pro+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_off0000b1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DF 10552 bytes
SHA-256: 49075a9a0cfb3653ff96a18cb79cb642ec451bca72c095b1558d23c5398972c9
font_02_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 16088 bytes
SHA-256: 43cd82bd52f9937ff0025a1c7de5c92deb6da30ce31e104ddd27f89b741b978a