Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a95e3d46a45871f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 23:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08d248269827f0ee6a61b9d4e5f292bf SHA-1: c516b53a44e8624943eacbf1821d6f1e8c4d0f0c SHA-256: 9a95e3d46a45871f107d82309bae5ddcdecd3bda540d010680fba19b6df0d658
166 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a high-severity finding for random URL links and a critical ClamAV detection. The ML classifier also assigned a high probability of maliciousness. The document contains numerous links, many pointing to potentially disposable domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bikeid.net/ckfinder/userfiles/files/demorepej.pdf In PDF document text
    • http://bhhangkhong.com/upload/images/files/duvawomesalogukugoze.pdfIn PDF document text
    • http://bamor.org/userfiles/file/galutilefipejitasegog.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/xifivavefelisuti.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/popavavefuvanofavupemak.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ntmugqr7ghj0s22jbgp5ep6gnf/bamutatofolikazijabeme.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/lerepuzizetavarebeviru.pdfIn PDF document text
    • https://aksusu.com/upload/files/47146966693.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/sujofitavu.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/85330829524.pdfIn PDF document text
    • https://kiptep.ru/file/wujimofewoko.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/kosoxumerasenak.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/51611527651.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/35351472362.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/vizizoj.pdfIn PDF document text
    • http://otczenacts.com/media/files/70877886944.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/natik.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/lonafowikubi.pdfIn PDF document text
    • http://workontext.ru/media/file/2779607281.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/timivono.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/35757609378.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae600ce74---80673153641.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/suderufitezofimavide.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/53865530502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=major+and+minor+chords+guitarPDF 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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 10860 bytes
SHA-256: e003b97a79c6229a06e7a21ae45fb6bd018ae8700337e819a46e25bb4018dfcc
font_02_sfnt_off00011844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 19124 bytes
SHA-256: 48e78ae616ec02663ed943857843c2869c60117707856f48a3f424914b4af59b