Malicious PDF — malware analysis report

Static analysis result for SHA-256 153e107a626d65d3…

MALICIOUS

PDF

86.6 KB Created: 2021-09-09 03:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79e55e47d9c75cafb23cdb5a6b7ae5bc SHA-1: 3739c36927ed94e8fed38621fa26dd04a292dee0 SHA-256: 153e107a626d65d3399bbdddf6c0323e0b3817c8ebf81a2be2511ce86cf2953a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a link farm or redirection scheme to phish users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.nagsa.es/ckfinder/userfiles/files/texanoxudawalewatadokokok.pdf In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/rigoloja.pdfIn PDF document text
    • http://yibetter.com/data/files/xovavofufubaxaw.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/11574250232.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/vuwazoxuxiwipoloroj.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/rubik.pdfIn PDF document text
    • http://prosquash.by/data/vasojipazat.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/musuraxebifanobegigi.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/40605967993.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/zutezib.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/bameninelubuxezifavojo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7fd61d1ef---82987667772.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/sasitoxunalanuwof.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/vebebamalujosisunijid.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/zanoxubijidupireruxaki.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/famebazoletisi.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/48162794272.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/jofibuzotofubum.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/mevizifazu.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/rolulediwivubagenawe.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/pereluwepubapufededelim.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/piwubepukekadeg.pdfIn PDF document text
    • https://birotex.rs/images/files/sipotunub.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/viwafu.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/94643938105.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/48463013364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=custom+camera+in+androidPDF 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_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 19848 bytes
SHA-256: 922ed8ef05aab717eaf86c3676b5f34ebf1ffdc6e6cef605aff19e77a6002993
font_01_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 10616 bytes
SHA-256: 51dd2b32dfa88d1eb5487d6c28a6e6affc609afc43d87694e9161cf5c768eb01
font_02_sfnt_off00013479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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