Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77f3edd42da35f1…

MALICIOUS

PDF

83.3 KB Created: 2021-10-04 13:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 79f9a5bbc5e4362a3264ebca03397190 SHA-1: 2f945b39f9909d9019c16c071af9609b5f857133 SHA-256: b77f3edd42da35f1c25fd317c501daafcfe91facfe8005708e9a9b4c2a3a37a2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or redirection tactic. ClamAV detection and ML classification further support its malicious nature, indicating it's likely used to deliver further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://owop.challengersports.com/userfiles/files/zikusozebovo.pdf In PDF document text
    • http://89928386.com/uploads/files/202110010207237554.pdfIn PDF document text
    • http://recrute.fr/files/files/risaxamazajebefumezurotin.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210909101456.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/85472695949.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/warid.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/11242637975.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/67674180862.pdfIn PDF document text
    • https://noddy.nu/images/file/88769050029.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109042311064576.pdfIn PDF document text
    • http://minerva-collection.net/files/files/jisagure.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/95419239454.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/65681016314.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/zigunipunev.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/wivuz.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/24801215894.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/62705514973.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/19846392237.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/44358501101.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/78369175349.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7e48d8afff95fc09c881c494264bafd0/jepadunizib.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/sexilelisope.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/31689073634.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/69417913699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=but+if+i+do+i+might+miss+you+babePDF 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_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 18652 bytes
SHA-256: 4e64f435a65d688ff6d02fa0114e70e5a24982a02b751aa907c60cbc4e83da02
font_01_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 10956 bytes
SHA-256: 3d201722382b8a7fd8524e1b7a599466c5880a4f39eacc2da51719711c6a2b5b
font_02_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1