Malicious PDF — malware analysis report

Static analysis result for SHA-256 45843a8fbb9d9ce9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 22:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be522aec12ed2f54fc59f79c4562c4c0 SHA-1: 276fc7c3dfcd2b3d39988bd2cd650bac61d7a891 SHA-256: 45843a8fbb9d9ce9b35983b3f7e46b536610619b2c3c4a0cd0ba29425c75931d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing sites or download further malware. The PDF structure and the presence of external URIs suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://www.aledrukujemy.pl/ckfinder/userfiles/files/zusupud.pdf In PDF document text
    • http://graczeonline.pl/userfiles/file/fomolina.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34083177089.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67725148700.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/37239162142.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/75681520651.pdfIn PDF document text
    • http://104408017.linker.tw/files/37456055569.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210915204245.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/tekerovoligibufefotas.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137899a7ca2c---12082082186.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/kujebuwi.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/32903498876.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/tezotinokusiwosugalu.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/46784127504.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/1490338713.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/sagoniro.pdfIn PDF document text
    • http://hotstamping.pl/files/file/xiwevezovomovobuxemez.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nixegiwikukikufawek.pdfIn PDF document text
    • http://punaide.com/userfiles/files/60452544318.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/11173345020.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ef503f8f27f1eb97ed6dc2568d05a339/kagotizonud.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/wigusodej.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/kojejokawemokirulupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+elements+of+investing+pdfPDF 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_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 18148 bytes
SHA-256: 7747e3c787efdcbd51ecb8ea3b486a35c6d27f562698133817b1a557d0904615
font_02_sfnt_off0001246b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246B 10712 bytes
SHA-256: b32878dbf3e1f71186b77eb36c754278e7081c084630421f376f567eb1acc4c3

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