Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf31967ea61cb99…

MALICIOUS

PDF

86.5 KB Created: 2021-10-04 17:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19abcbb206faacc2a58a9dd3ee515526 SHA-1: 7724e412108df88ceed2388d9407aaec56eeb052 SHA-256: dcf31967ea61cb9921aa7b6d137d907619975223b230d08e1dc82f97fa0c7d07
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to disposable domains, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this PDF. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=strongest+members+of+the+straw+hats
    • http://agecarekorea.com/ckupload/files/nirelebebivegagekizezuda.pdf
    • http://dogalakustik.com/depo/sayfaresim/file/gunewadi.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/7480201505.pdf
    • http://vegman-kzn.com/ckfinder/userfiles/files/28605857616.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142958bae855---nafumaxaporobe.pdf
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/56231475868.pdf
    • http://randoquad72.fr/userfiles/file/16411490715.pdf
    • https://tigapilar.com/upload/files/wubobavemonu.pdf
    • https://yumasri.com/assets/ckfinder/userfiles/files/74152562125.pdf
    • http://tongchangkj.com/uploadfile/file///2021092503423791.pdf
    • https://latework.cz/soubory/jipivil.pdf
    • https://www.sophrologue-nimes.fr/upload/news/files/87833610436.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3eb90d539d1fc75b8dac6b7955a3bd96/53092960930.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/21767348510.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/97087996831.pdf
    • http://shmgec.com/Uploadfiles/files/naviwelejixusewajizap.pdf
    • https://geloracinta.com/contents/files/29673985407.pdf
    • https://greassi.com/editor_upload/file/zerekigu.pdf
    • http://farmaciacogliate.it/userfiles/files/6350826508.pdf
    • http://ganteltechnology.com/system/userfiles/file/56816437678.pdf
    • http://muacuoi.vn/Pictures/files/83830994777.pdf
    • http://piscesappliances.com/userfiles/file/46874515991.pdf
    • http://ilyxrace.com/userfiles/files/vevulizijokatonifubeb.pdf
    • http://peoplefineart.com/assets/202109/files/20210918235221915613.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/nutowawawopemudedam.pdf
    • https://tapuionoticias.com/ckfinder/files/vetebiruzedam.pdf
    • 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_off0000eaff.bin
5b7f762127c0fb0141395a0c357aaaa39222957b168f6369fcf5e1a4b3daca0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 18648 bytes
font_01_sfnt_off00011b23.bin
ba11e26465489e915b7ad7bd45975fd5df3b952be10029b0da81bf27b30e6b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 10824 bytes
font_02_sfnt_off000133fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133FD 16792 bytes

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