Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61290bcece07777…

MALICIOUS

PDF

90.2 KB Created: 2021-09-13 10:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3e90122c31e0a8ca1869f42bec66557 SHA-1: 8f315773c75ef0a021054fa700d53b2b8068df95 SHA-256: d61290bcece0777777baccbab0ec1c8ed1f935693ff85897b7044996e449f1be
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, presenting numerous links to other PDFs, likely to obscure the malicious payload. While no scripts were directly extracted, the PDF structure and its classification suggest it is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stellar.ru/ckfinder/userfiles/files/xinisobifuzejo.pdf In PDF document text
    • https://albizy.com/ckfinder/userfiles/files/43340287742.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/91135a357a27d2267ada43658b6fa20a/nokun.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/titobusevigonukavulukal.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/gexanetifawoxegegor.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/43787188925.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/20915846843.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/67787242705.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/74413128223.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/5475861090.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/jimekusini.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/64732672510.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/davegapakofaboxozas.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/59810229291.pdfIn PDF document text
    • http://insei.eu/userfiles/files/zavogamulerib.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/xekazul.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/j24oqild3vspj63iabvkaiu26k/43626716119.pdfIn PDF document text
    • https://agatanorek.com/files/file/melatewivubasenoliv.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/vowog.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210901_B8C41E59CB5785C8.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/20396180195.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/zukafabed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=secret+call+recorder+hide+appPDF 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_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 18488 bytes
SHA-256: 464022941cee3b15a9a1d2ef5a6ac9ae48e8a6fc5fc8f37c1575b5f2a17191ac
font_02_sfnt_off0001436e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436E 10416 bytes
SHA-256: a2db18f0e0db5d31fc5b4ec7734de75244fb990d0fe59ee10ee1acf450e0319a

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