Malicious PDF — malware analysis report

Static analysis result for SHA-256 b903438b9b032d40…

MALICIOUS

PDF

86.8 KB Created: 2021-09-11 17:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31d3876d6c6b3252a2c88bb252d68407 SHA-1: 28cfcc66a34e768e92407872d99b1eb5e34ebd9a SHA-256: b903438b9b032d4071c2fcd1683ff87a43ffaa37d2700c1d4e034a1625834ca0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, with a high number of distinct hosts. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a deliberate attempt to obscure the true destination by using a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/33479586908ed2ffcf039dd98dbc54a8/jetivomemuxasuxesix.pdf In PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210911_F1D0D1BD7AC6BEE4.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wazilozaxoborileneruvufab.pdfIn PDF document text
    • http://donghotam.com/luutru/files/soxupojozi.pdfIn PDF document text
    • http://tano-cable.com/d/files/74602832407.pdfIn PDF document text
    • https://purefeeling8.com/data/file/pelokiv.pdfIn PDF document text
    • http://shamayachts.com/upload/file/32462587589.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/41554593862.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/95667764258.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/xobajixowizidisux.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/lotavuwomipotamebabebiki.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/nebaxivule.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/89798656064.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/55776990090.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/8354431302.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/tuguropikenevovonitoweji.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613165D02187B.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/33973079603.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e9379fd77---zifagumeleduralafapamud.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/josobip.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/99848499789.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/17722247174.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/50204243631.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/55455035664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+pair+airpods+with+an+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_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 10644 bytes
SHA-256: 8eddbdcae3e11cb2ad8bd3d59de2f43f0dda376657f155f78ea2f4bd20ce0427
font_01_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 17272 bytes
SHA-256: 8286421822c1a868fc370c256dc13adf2684c45422a88615c5ce385155149ffd
font_02_sfnt_off0001351e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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