Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3b440699c06b67…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 18:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0e76579ffb076ab665e45b730f9d4bf1 SHA-1: aa9d0e904f2b685474ae38151f888b98f386ec81 SHA-256: ad3b440699c06b67eea54ec6f33b932b5fe7a2bf7890d8f5b521e238e67fe37d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to external PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for links. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for exploitation or redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://kiemdinhcan.com/Images_upload/files/83484542132.pdf In PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/bukilikewokezebinupas.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/60936201437.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/fazuxokivudomedab.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/tetibedifelavevirewedej.pdfIn PDF document text
    • https://forumsevens.com/images/file/kuzes.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312aca0ff0d---lejotaxidadubokazuramuwal.pdfIn PDF document text
    • http://laserinnsbruck.com/static/54571734095.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/vakefujuno.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133178226757---zukojepavalotojarafulor.pdfIn PDF document text
    • https://baglab.pl/galeria/file/zizurepazokatur.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/93717409563.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/51621007697.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/xemanejepulovixave.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/vafekatavawitedogaviw.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/kowenodazo.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/milapirufipudi.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/83181486527.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/53740171828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=watch+the+snyder+cutPDF 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_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 18908 bytes
SHA-256: b6ccd364c6a85df79d79b49a9044a9e71d04e450c366f5edc84402f149c4a6f8
font_01_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 10416 bytes
SHA-256: feaf13f192a2ae9f515b08c65d91f132b39c456b3acc35f949f663534c77eb44
font_02_sfnt_off0001345c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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