Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ee5fe6d29cc144…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 08:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cd32e52cffdf9212348b574c1456a4d SHA-1: 28721574c1ac084b4d701cdff569a6f8527f9990 SHA-256: c4ee5fe6d29cc144d895858a1f787f48e0b9fd9dbfb25a6c625f57758003fc0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to suspicious domains or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://svingenieria.cl/userfiles/file/muwetokixesuwivirumeg.pdf
    • http://th-hl.com///upload/files/5633878194.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/65a9b559a6200983ef285d0743c018cf/97655023263.pdf
    • https://redengewinnt.com/userfiles/file/zabelokojepakezo.pdf
    • http://greenworx.eu/images/uploads/files/buvubejatusupa.pdf
    • https://livbiopharma.ipsrvps.com/userfiles/file/mujusuwoni.pdf
    • http://lqhuachen.com/uploadfile/file/2021093021472873499.pdf
    • http://metaglas.kr/userData/board/file/jigubisa.pdf
    • http://fixafilm.se/userfiles/file/sogoliginogonunavoxum.pdf
    • http://huyndaicaudien.com/upload/files/jujusikoxaragegu.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/68466832624.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/219fa03c0157a34a7fc1d0deb97c47cf/21662831034.pdf
    • http://erulingua.hu/uploads/content_files/files/jalovom.pdf
    • http://ztracenaexistence.cz/files/content/file/raduwepezuwimaxosu.pdf
    • https://illustrations.noche.fr/images/files/guzejejubudukaxudorejob.pdf
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/14729922759.pdf
    • https://medicabg.com/uploads/wysiwyg/files/pinewi.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/49318280766.pdf
    • http://china-zub.ru/userfiles/file/19075410221.pdf
    • http://stacjaregeneracja.pl/userfiles/file/xurojalozesexekedulirof.pdf
    • https://isitekmuhendislik.com/userfiles/file/nugoxalavaweduzaxil.pdf
    • http://webbuilders.com/files/file/21191581488.pdf
    • http://sevenseahotel.com/uploads/images/files/godezarizusizud.pdf
    • https://nazragame.com/calisma2/files/uploads/kepotafij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=philippines+country+code+phone+number
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b43b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB43B 16792 bytes
font_01_sfnt_off0000cc4d.bin
829fc2d4077a8c9d71337c779203536477d1e3c09aed7e03e2b285bb9f377625		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 16088 bytes
font_02_sfnt_off0000f587.bin
fba6fbaea4551102dabb0818a19864ae07d012657206679a761d205e68730501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 10972 bytes

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