Malicious PDF — malware analysis report

Static analysis result for SHA-256 a546d02d45989d6b…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 23:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 637cb48679497fa6038fc343358b625f SHA-1: c3f2f4eaba2f8ef577c45c894c4aa8bf1dc75a7e SHA-256: a546d02d45989d6ba35bd3b60862dc3ce405a7c6481c6ead2a4200b4fd710a51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.prshots.com/ckfinder/userfiles/files/xafewurate.pdf In PDF document text
    • http://newtrichur.com/userfiles/file/nowusin.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/zojuj.pdfIn PDF document text
    • https://geniodelweb.com/file/84086431889.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613730d8c4734---tabipetodi.pdfIn PDF document text
    • http://xsteelstock.com/d/files/paxegipoketudo.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109170232537535.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46739315596.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/89018017492.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/betibiwazukutubinanuzom.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/rosizuzazufom.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/5709168651.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/nubanuxowinafoka.pdfIn PDF document text
    • http://belv.ru/userfiles/file/5627337456.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/xonotiveme.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/22285586799.pdfIn PDF document text
    • http://change4best.ru/upload/file/93042689309.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/55315940920.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/xerewaxavufojeleguka.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/97407922710.pdfIn PDF document text
    • https://ijp2.com/contents/files/jiwazurukaxi.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/20710597244.pdfIn PDF document text
    • https://bursac.net/userfiles/file/20877743016.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/43547541363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=spider+man+movies+free+to+watchPDF 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_off0000b518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB518 11064 bytes
SHA-256: 6eeea356231b2589ac3440a6e1067b0809a92b58f651750a73a221352b56bda5
font_01_sfnt_off0000ceb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 17604 bytes
SHA-256: 08410255b4cb3b0e65ec780bfae046a25e027fe5b63843309477410046fb286e
font_02_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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