Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f972f98247c2792…

MALICIOUS

PDF

89.9 KB Created: 2021-09-23 05:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e21a26f3f3fd3659b7ad073fb59ea2c SHA-1: a53da9e9d78b266ace30b9d46cf0e599e85cff1a SHA-256: 8f972f98247c2792231fb77a7a47f56dd512a507dddd0dec7d8f18de03b70205
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm designed to redirect users. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613215f5be4fd---89341246342.pdf In PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/26190780637.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/feretofi.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/76942743609.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/wukoramu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427f12a84d0---92297227332.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/gupofatigige.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/42559046087.pdfIn PDF document text
    • https://rippa.pt/files/file/limoferuzoronarek.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gilaf.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/60020415433.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/96001356348.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/12457474216.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///gurukimobowesofukefobopo.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/80063590800.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/98469403028.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd7a8f766---55386533261.pdfIn PDF document text
    • http://rrarental.org/upload/file/48804803582.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/nozilolojobadoriw.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/wupuzekagexuwatim.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/zuwurevajin.pdfIn PDF document text
    • https://songhong.info/userfiles/file/rusorapofoza.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210921_5E53CE9AAA5FEC44.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210904025219175112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=youjo+senki+light+novel+epubPDF 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_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 22156 bytes
SHA-256: afede8feed9419fb6e1f3e19c00f490555980b351c359eaa27eb439584ecb499
font_01_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 10780 bytes
SHA-256: 68a1f3a49f17f618ad4a714ce4dd2c3c412072263cb62a802de48bc753710be4
font_02_sfnt_off000140dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1