Malicious PDF — malware analysis report

Static analysis result for SHA-256 599518565828c624…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 00:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6286bc5636c486970531ed614749e7de SHA-1: 96e955ba39b38f256955aeecae3b560e7261a363 SHA-256: 599518565828c6245361da97ed6fe0d416eaa5eec6cb20a4825b59f3c9f1d44f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple disposable hosting sites, likely to distribute further malicious content. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a666d1ae---lasekojofaluse.pdf In PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/muzututugeziwewumojivip.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/zigewujukaverarozewox.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/suvupemebifipik.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ab6871d3---16546316284.pdfIn PDF document text
    • https://almavilag.hu/files/files/lojujotiwexemosimabo.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/jelegabel.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/medabenapuligutigapuk.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/dewujoz.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/jikuza.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/jajawotimikosepebipa.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/46437892486.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/ravazibaraveropoxod.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/74177295065.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/sevatijemepa.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/92311366027.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/zirutekosedapunagufedew.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/59116851628.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/tuxedozojupa.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/34274697512.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/11900429088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ps+plus+exclusives+fortnitePDF 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_off0000ca64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 10580 bytes
SHA-256: 0277bb51547807d373500dc92e00a0dbb42b7f202979e2623d778ee92ceaeb52
font_02_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 17848 bytes
SHA-256: 84d3b7365ae31d4f3d7b1c6d71210ec78a2085cc6a7c32636cdef69a3eb95e8e

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