Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e09ec7914b0d2a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 01:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7783e08905fe835ceb32e3379498ecd SHA-1: 1c310253cab6cf78589a7239e53b43fb34ac097c SHA-256: a1e09ec7914b0d2a1c7658e0b0944681cfce33399c4eaf5c8290d4e833e407c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings point to the document acting as a link farm, with numerous external URIs pointing to potentially malicious or phishing sites. The presence of embedded URLs and the structure of the PDF suggest it's designed to redirect users to these external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=gif+android+studio PDF link annotation
    • http://bijverhoeven.nl/uploads/files/buguratumo.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/tuvuxetamu.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/40632343930.pdfIn PDF document text
    • https://hirurgija.me/files/23533767725.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/zexitoniminekup.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/bifikukiti.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1d4dae38c---40597131069.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vegotogegu.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/81925402714.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/tebetafotor.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/72288188010.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xelamigisezovodivavura.pdfIn PDF document text
    • http://www.polni.si/Images/files/87027477723.pdfIn PDF document text
    • http://e5tbr2.alruaa.com/ckeditor-ckfinder-integration/uploads/files/pawizuzalivazi.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/dimomekijopo.pdfIn PDF document text
    • https://matrixx.lu/images/13177175659.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/m0avcbe2ml2ps3snh7re21qhsi/33303608517.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/74365761523.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/93002578138.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/lugolubameg.pdfIn PDF document text
    • 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_off0000aeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEB 10308 bytes
SHA-256: 54349f4ba1450bb1ddcb62804ab3e7d550420a3dd0aeccf48d19b6efd39e3a9c
font_01_sfnt_off0000c645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 15616 bytes
SHA-256: 748c0c1d7d6d00c5637bd80dbd6077b8157d0d2572f1343de28970249c21919c

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