Malicious PDF — malware analysis report

Static analysis result for SHA-256 c518063ed6f69229…

MALICIOUS

PDF

85.2 KB Created: 2021-09-15 20:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 81a6ac874118c1d90c31d91e64edcd8e SHA-1: 88b209c5b5f4c3db7e443e617900ccb352b08521 SHA-256: c518063ed6f69229d46d565f7a8119d8cb492e97c86e24ed98540c9db34ceb02
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable domains, indicating a malicious intent to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The ML classifier also flagged the PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16133d592e8cc0---60236904196.pdf In PDF document text
    • http://cabini.it/userfiles/files/wixitufululob.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/gejokatimapa.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/82987981382.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/66931563542.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/10562062228.pdfIn PDF document text
    • http://grabnerestriche.at/35935247377.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630469241.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/21774483735.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f6f3d0161aacc7fdc7c84c2624019de4/nulerato.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/susimegukisega.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/padide.pdfIn PDF document text
    • https://qnzar.com/files/89591962997.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/75712739662.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/beguvogevelewev.pdfIn PDF document text
    • http://synowka.pl/galeria/file/taximerusagomowuwumo.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/62898820117.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/16989093323.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/supapon.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/powobez.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/96927716915.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///ruwakobilukuxutofu.pdfIn PDF document text
    • http://rs-entp.com/upload/file/verasirubaxu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed40c3111b---sumepojaxoposomilolami.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/23928784713.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/27507409536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=my+hero+academia+ep+1+season+2PDF 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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 10916 bytes
SHA-256: cfe6a65e7898672f1132fe6c7df18e9733854f8f94f9cd6b1f329f6646231a7c
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 17516 bytes
SHA-256: 04eb869b436a7ac85988d8f9c1b36a19e7352a60a1ea6700b0562d63b525084d
font_02_sfnt_off00012f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1