Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7ec38a73a5ac70…

MALICIOUS

PDF

73.4 KB Created: 2021-09-24 08:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1020dc9e7ace36a276cb2d30d81056b4 SHA-1: fb0f1d6fd5ce1a409737048ac8d856d3cd518834 SHA-256: eb7ec38a73a5ac7069360b770d430b970316c739dc511d610111c315eae72a88
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including random and disposable URLs, and a high ML classification score. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the overall pattern points to a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=android+programming+on+linux PDF link annotation
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/47555753886.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/10024309245.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/meritizafofowizijulevev.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/85131080382.pdfIn PDF document text
    • http://flomojapan.com/upload/files/kitarid.pdfIn PDF document text
    • http://sbcnepal.com/images/file/10233244588.pdfIn PDF document text
    • http://dsagco.com/Upload/file/dixepixipaweravukejikume.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/gamujaxusuzamok.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/70569280628.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/gogewaxujijaxixoxuv.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wutunega.pdfIn PDF document text
    • https://searches.onlineconvey.com/userfiles/file/58087864260.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/22917379075.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/sowubumepe.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/pojujupamotulofogud.pdfIn PDF document text
    • http://fivelscope.net/fckimages/81171534849.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/tesunekoxoneloru.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nejumotevuxal.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/32ece6db16d5c54d1e1096c06cc03d86/92632391692.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/31999288051.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/moxidenepoganewuzesa.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/tumikuru.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/30405079720.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/12110759136.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/57802179901.pdfIn PDF document text
    • 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_off0000bd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7F 16456 bytes
SHA-256: 1b80685365da92580e1095078058258a36049c0cc0bcb3e8e947b7830afa7bb6
font_01_sfnt_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 10520 bytes
SHA-256: 1a75b90f013495491cda0518a82929c9c6a6d3fca369d60669b2ce7caa5a7405
font_02_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1