Malicious PDF — malware analysis report

Static analysis result for SHA-256 d350d2d1711b05f6…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 21:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4b7ec44d87ba7f0c0ba9bd72a07e13a SHA-1: f5990131c46a33b3d667e96fc99ec2f84711323c SHA-256: d350d2d1711b05f63d9b8c8bd7370af44a6d8d9dbfe8aa0a89a8805fe9276797
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to unknown or potentially malicious domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent of distributing links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://rosenstein.lu/userfiles/files/85099656691.pdf In PDF document text
    • https://lighthousemacau.com/html_upload/file/13745219496.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/mesazi.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/polofevewedunanugojesewe.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/87214974706.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/48036596535.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/romawikalotedux.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/34892694558.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/34085024647.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/diposuvasafozow.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/xenoden.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/49712827119.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/14446403813.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/netax.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136202a6c1bd---pekizabiwaxowinabedanujil.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/kejexapitesetixinedirato.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/27087465381.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/1714054788.pdfIn PDF document text
    • http://autovoda.ru/upload/files/3369914490.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/mufesaregabujopuja.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/65604340886.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/61352874506.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/94897674408.pdfIn PDF document text
    • http://venkateshservices.com/uploads/35532900160.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/77109449170.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/54816380878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=i+love+you+my+love+quotesPDF 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_off0000bbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C5 15796 bytes
SHA-256: aae545a848e991288f8ef7d60215215ca52e80e655b09142721354264be0674c
font_02_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 10188 bytes
SHA-256: bfff6059249a50f340eecb641c857625fd8de2f08a78c2686bf978280298bb3e