Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47673ec2419abe4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 03:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61ac90f8b8b31b6d995fecc066692a5d SHA-1: 9dd95f5b311cbcfe7da7ac2f4f8729005a2606f6 SHA-256: d47673ec2419abe4932576a2d1ee0899e982ba372c9577417574c53a70a91ebe
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' and the numerous extracted URLs suggest the document is designed to redirect users to a network of potentially malicious sites. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://teraval.cz/res/file/rogitev.pdf In PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/donifizalogu.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/57308543634.pdfIn PDF document text
    • http://becucci.it/userfiles/files/bufetam.pdfIn PDF document text
    • https://everestart.com/images/stories/file/66984192643.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/purekosovox.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/vanowopot.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/58372321373.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630941673.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/bovaru.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/lipugisasalatilof.pdfIn PDF document text
    • https://unitjaya.com/contents/files/kujoguja.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0e08c426c---65369545636.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/tarade.pdfIn PDF document text
    • http://cutskytools.com/d/files/68314669334.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/88431965252.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/17326257275.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/banomepojizejekab.pdfIn PDF document text
    • http://liluby.com/upload/file/punewanonegipukodet.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/vaxonowokuferiloje.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144c2fba52bb---xenaketofi.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/95658217284.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/davevirek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=neutrino+instagram+apk+downloadPDF 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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 20740 bytes
SHA-256: 96886e072f694aca23c9a3f7ac6d82db0188b30286abe31e53458ef31b5ea5e5
font_01_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 10988 bytes
SHA-256: 1251dbc003fa8e86b904b56689999ffb2b38fb430d809b441a8f059720511dca
font_02_sfnt_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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