Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61ad3552056c338…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 22:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 750fb1fcf8a208bc8d7c83430562747c SHA-1: a29f96b9a350f5a56fd2e86d9c9021c062c7c63b SHA-256: c61ad3552056c3389574ae1b59f2876ee2c6a825e65b4ac72a023ec08419f931
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=lucky+patcher+google+play PDF link annotation
    • http://banlinhkienlaptop.com/userfiles/file/nenuzexaginilawexugo.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/61824243505.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/lenitemute.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/pigadodutubusabalagiruxif.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/gisejokimavik.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/89402762682.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/17543176934.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/56064060697.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/60025272862.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/wonalekotamederogaratimu.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/defikokavatidonekatax.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/28119541772.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/65179300871.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/33635450252.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f04b79b81---satorovipine.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/mekolowudafapotirozoka.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/xujoma.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/25374518595.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/9088421430.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/33286843153.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161458fac31593---29810019316.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/53889525056.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/4726989732.pdfIn PDF document text
    • http://tion.hu/upload/file/63767067864.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/vepixudaxajup.pdfIn PDF document text
    • 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_off0000affa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFA 14412 bytes
SHA-256: fd32af6b6c2152c61e42324c893064d613a50cc068ffdc7028fa59b254c2276a
font_01_sfnt_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 10552 bytes
SHA-256: 4c582c12ebebd99e6f7ca02f0cd80d691414522b05ef18bbfe9307d96c631f45