Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76c390fde1915bc…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 02:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe98f6f0fe2b73361e800c682d1fbb71 SHA-1: 2c046e04895f61feaa248eba8949330981fc636a SHA-256: c76c390fde1915bca910dd057f0b63c86efe9c89a021d3e401d2836d89dcdd51
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, indicating a likely attempt to redirect users to malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a pattern of using disposable hosting for link farms, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://aromamahabaleshwar.com/ckfinder/userfiles/files/dukuxosanigop.pdf In PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/mebevugonafuwimonel.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/parasaxogesowawopodotijaj.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/namazunenizusipixa.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/duzulikulis.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6060c39de5ab57a684e61a23df64722f/delujawutinogegopus.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161340727e80c1---kesewedevukomuriroki.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/61333700666.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/8976902367.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/wowebadipa.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tepib.pdfIn PDF document text
    • http://balalajka.nu/media/1513060167.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/47001653928.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109191610038716.pdfIn PDF document text
    • https://akconta.com/uploads/files/80956003651.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/69190052692.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/xarumamezesapopa.pdfIn PDF document text
    • http://learningkey.org/userfiles/roronolasuxawusu.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/21182527471.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/97936919585.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1777768671613b3b6cda931.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/xojekujupirob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=you+broke+my+heart+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_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 18124 bytes
SHA-256: c62344e6d219cb9314fa33ec4853f6976ccc2e328ae3b59bcb29cef29bfc7b56
font_01_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 10708 bytes
SHA-256: 618f9da18c185a6ef50253e7d63e5fd5983012f20ee65c8b7b8a3dd86f8f3666

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