Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddea67e24bd02d03…

MALICIOUS

PDF

79.8 KB Created: 2021-09-14 01:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f37f468991bb7fbacea09a18765343d SHA-1: c65d9dc874a34ad5a48841f34c293c94cb697ba7 SHA-256: ddea67e24bd02d038bfcf55f6b1977d6337e1146f3b3d3bd1810ee149e47a7c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute malicious content across multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/rexafopip.pdf In PDF document text
    • https://photojet.bg/userfiles/file/juveme.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/12651288833.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/66550062507.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/25877530429.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/65037352396.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/39013053924.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/5356140474.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4789e954e---dulufubugadigagopeb.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/wogalotuvawuwowevisevefu.pdfIn PDF document text
    • https://egca.fr/userfiles/file/83929151231.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/95681071009.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/46501771925.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/nesetoxizofanoxukowof.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/lutoge.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/wevokewulajokan.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3d683e4e---24936472987.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/57549249232.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/45025411841.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/45334359384.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///zeferanevilaruzulopubed.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/gapatumoniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+turn+on+screen+rotation+on+androidPDF 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_off0000d039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD039 18996 bytes
SHA-256: e0fceb19d21ef9d25b0bb74aeb56d639525e1c64bac2d217c4872c3feae960ca
font_01_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 10492 bytes
SHA-256: 6c3fbdf01673bd7eb42efa2e55046e30e3be3268fff41d7309da4a58f2b7d4ec
font_02_sfnt_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1