Malicious PDF — malware analysis report

Static analysis result for SHA-256 87670c0e1a484612…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 12:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 510a101b892815989fbfcee5f1e3b5bb SHA-1: c40ee7498002201c07b353abf220f04b551e375d SHA-256: 87670c0e1a4846123b1a52fc42e07505c30bbafe41a084b6ea0ef3b94d446f63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to external sites, suggesting a lure to redirect users to potentially malicious content. The PDF structure and embedded content are consistent with exploitation techniques aimed at client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cityface.cz/res/file/setagawam.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c7316721ffa6541194c0ba50d174445a/12733337450.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c595c62411---nefefadogolefuwesenog.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/57180834674.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/semum.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/tilevibeg.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/30380670712.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/40521060896.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/5051274675.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/tadipelexivuvilanofeg.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/fevusino.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/13898581057.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/midob.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/vujobaririfegumad.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/kowajotawuri.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/88807797858.pdfIn PDF document text
    • http://honghuibio.com/d/files/70282361652.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/sadebapu.pdfIn PDF document text
    • https://camelcarpet.org/d/files/zeliredugodu.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/dukij.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/xopapabusukefani.pdfIn PDF document text
    • https://parkettworld.com/upload/files/jipajufixejive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=passive+voice+reading+comprehension+pdfPDF 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_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 17580 bytes
SHA-256: 53b76c34bb6b71a923f70847148ede42ce625fa85e97ec9ba091e5d31d6a7f6e
font_02_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 10992 bytes
SHA-256: 6116fee694ee27d84c93356c33a482b8bcc61eb392bfcfd54b2ea10c220cd0ca

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