Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2545f3b418a333…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 23:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2727bcf5e74fcce458a90d22f6613bdb SHA-1: 67c17d4af31b766c58229f36655faf8404469aab SHA-256: cc2545f3b418a333852e43ffed0491688aac0c571bddb9d9d52c59e60db19451
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and is flagged as a malicious phishing trojan by ClamAV. It also functions as a link farm, directing users to numerous other PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://brillimet.com/uploads/files/202109181917522011.pdf
    • http://mishelik.ru/userfiles/file/kexivowimopom.pdf
    • https://artemishosp-em.tw/uploads/files/202109220236455825.pdf
    • https://kentacademymiango.com/userfiles/file/7253295915.pdf
    • http://2990592.ru/ckfinder/userfiles/files/powameruvesunok.pdf
    • http://spbmedaks.ru/sites/default/files/uploads/71672812740.pdf
    • http://lerucherdesanges.fr/userfiles/file/tejukolozadevubi.pdf
    • http://radiosalsa.fr/php/rs/filesupload/file/mofefeze.pdf
    • https://resicolor.com/upload/files/nakawosewezemevuvexe.pdf
    • https://gullyracing.it/admin/ckfinder/userfiles/files/41480808287.pdf
    • http://ciba.lv/uploaded/file/luxamaxumajoxoferopuzerel.pdf
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/kadifi.pdf
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11371204639.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/83948488610.pdf
    • http://lagrupacio.cat/file/64470562239.pdf
    • https://naves.cz/res/file/sefenutorip.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/kolalipuxise.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/95901815931.pdf
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tarimowumunalox.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/7259131168.pdf
    • http://kystar.net/filespath/files/20210908044644.pdf
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/dowiketewoxetelekuxud.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/39944784257.pdf
    • https://sanmuabandoanhnghiep.org/images/content/files/duxixekinil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=head+first+android+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_off0000b0d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D9 16792 bytes
font_01_sfnt_off0000c8f0.bin
d81c1d2003e3417f927669d986b23b6401db5a1b9d0823734ced8b2d9062449a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F0 10436 bytes
font_02_sfnt_off0000e0a2.bin
c47cb09b9d23cd944d928f3cdd47b61fff0a87f0f787d6d6e1214c96fbcd59ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 16988 bytes

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