Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c4fdeff0dd0626…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 22:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5fc1786788b06b7d4231dc5b98abe916 SHA-1: 08d27e5faf79c83cd4a5717b4fadcb9acf3cd9d0 SHA-256: c6c4fdeff0dd06269ef4d3f2363f51f52abcbeed009506ecbb4f7c6eb6739d77
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with many pointing to unknown or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous outbound links suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.auto-ecole-acm.com/ckfinder/userfiles/files/karijumesaguzilolajekura.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eea3ea8d7c---sabufu.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/16410221119.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/ritepijavokasedig.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/78797645051.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/10421265130.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/8761032111.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/67015387770.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/44533436262.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/13924217334.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109150337568553.pdfIn PDF document text
    • http://wwstationery.com/files/file/wajojifiwufenox.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/52554882162.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/35257835477.pdfIn PDF document text
    • http://paradoxine.com/upload/files/pabulugi.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/xugururulupalumek.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/bimofobilelebijasu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613abcedcaf12---19319254448.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/77726375733.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/93768516863.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/24962411585.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/nuguwanegavopo.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/88085924362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+music+player+symbolsPDF 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_off0000c0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 10912 bytes
SHA-256: c9c892a5e7770e3126a9b602827f0efba546a06a99275a2b620b2549e16e4c5c
font_02_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 16152 bytes
SHA-256: f545b83e020ea18672e53e601747ab3c5a707adb402226c67be042b7e0e1b434