Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f7cb932573f51e…

MALICIOUS

PDF

87.0 KB Created: 2021-09-20 20:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 22b627999a713d722df4a09392149d8a SHA-1: cbd13c5f03dd7f2a078fabf7f40855090f0d0dc5 SHA-256: c9f7cb932573f51eaa048784c891544beab707053b8c5e5c0dcb8f0eb5722db5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body was unreadable, but the PDF structure and URL analysis indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=how+to+send+a+text+on+an+android+phone PDF link annotation
    • https://robertbah.si/files/file/fugivugibijonederedeg.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/61475719502.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c4b57200---tevarofog.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/rexifesisi.pdfIn PDF document text
    • http://riph.pl/userfiles/file/lomebe.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/tutixisanolipoburek.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/52105813567.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/semiruwutofewizeda.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/86708995090.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/gusitafotolarizelis.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fk44uajb10ckodd2kqaj16kdn4/zosebage.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/joxipisaxosaj.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/rezusel.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/munozafiregakub.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/kifawova.pdfIn PDF document text
    • https://melz-feu.ru/upload/48627647969.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/98388283405.pdfIn PDF document text
    • https://777mto.com/contents/files/91808440353.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/5528816835.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/gamerinuzaz.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210911055331369.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/lawupikurelutosawo.pdfIn PDF document text
    • http://8njl.com/userfiles/files/fidinaxulukumafij.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/98920768418.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/vesonomejezuwajafan.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/pubowizosufoge.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_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 18240 bytes
SHA-256: 709949cfc0b2f5458ee2c890a24dd312e9052076635191b23d016fcd8de4b909
font_01_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 10624 bytes
SHA-256: 577c3f6afb94a6d8b3bf8e1fe8f54bf63376de8fd15fba91808d138cd33c11d1
font_02_sfnt_off000135e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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