Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61232070a07cdf2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 18:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 499fbbbce51b9b270df6fbb916e4d7f0 SHA-1: f5a2e00625371b8a23e66e52001277128a2598ce SHA-256: f61232070a07cdf2e2046e8f1a423c97c1f09b5ebd5e3cac7550cdbefd755c6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=color+sms+theme+app+download PDF link annotation
    • http://currycornersugarland.com/admin/images/file/sanulelef.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210902163056150952.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/mekalagizubejal.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/58333716743.pdfIn PDF document text
    • https://brakos.it/file/zavukelemoxofa.pdfIn PDF document text
    • https://parkettworld.com/upload/files/kalixupovuxuduv.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/buzapalapudumar.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/kagumivo.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/putajutatokow.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/13718804368.pdfIn PDF document text
    • http://dezis.ru/uploads/files/90490123336.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/kanogu.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/zarajavozavugekilikujodo.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/39212596396.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/voxulavezudijiliriv.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-17/20210917144525358629.pdfIn PDF document text
    • http://etkenkalip.com/files/ridaxepeduguvekugunija.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/845108378.pdfIn PDF document text
    • http://a899.net/userfiles/file/98266668296.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/89408996549.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/18830257856.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/81971442154.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/xirobifagekivufigibarut.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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 18896 bytes
SHA-256: ecf54eb171412ed643e2e51cf2b1837efc7d12ba911c72c2d4ac32f861b74c05
font_01_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 10684 bytes
SHA-256: a20aee29ce10448abe929d267f8ce40661ca1a7d7b2fa2809b933a7cea7605b5

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