Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91e5a46dc55f184…

MALICIOUS

PDF

90.6 KB Created: 2021-10-12 14:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 53e0205b7366abb925f1bc83b4f68ad4 SHA-1: d050c0fd6dbd216314be60755a7793c7ec3d7beb SHA-256: b91e5a46dc55f184460ecbc795c2e7b7f016ee28fe1ae3e6b411de103a4dfa48
126 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. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL distribution suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://southafricapools.com/contents/files/51360653170.pdf In PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/nezafiregakozixuno.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/diibq6qorjikugs37blchjelcu/lobagefuripekudive.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/84135573963.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/pafimawezovowuzuzupuw.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/sirizavejugomenuf.pdfIn PDF document text
    • https://kimcert.com/E/file/16068309913.pdfIn PDF document text
    • http://airserbia2009.vs.rs/multimedia/file/jetawolubazapotilu.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/65088882009.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/51217208932.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2d072fb97---37289830550.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/xaxomanosonuverew.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/94923751501.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021092915351373499.pdfIn PDF document text
    • https://path.mn/userfiles/files/72023277045.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/13747147445.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/lurebive.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/fogegab.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/pulezipeg.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/mitosodogakorogegikanale.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/faborazile.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=pogil+enzymes+and+cellular+regulationPDF 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_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 20528 bytes
SHA-256: ce94020b267da936f4d91960529789bae7c79ef6b85a07fe37b8dbace06c40c3
font_01_sfnt_off00012bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 10988 bytes
SHA-256: 6d7b06fa4543aefd56b28dc0172227ea00f7fd205688c9afe27e2486bc1e7648
font_02_sfnt_off00014517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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