Malicious PDF — malware analysis report

Static analysis result for SHA-256 212f8eca1e653197…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 09:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e06ad97de6ab5ab6040081af016d978 SHA-1: 8ae73f76125531a8ce63367e8e1f46f260f35de5 SHA-256: 212f8eca1e6531976504a4faf49542a3f7e4a0752689a64b64fb5a663d725550
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is `https://wastran.ru/uplcv?utm_term=amazing+spider+2+game+download`. The PDF structure and embedded URIs suggest it is used in a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=amazing+spider+2+game+download PDF link annotation
    • http://fsgzb.com/upfolder/e/files/20210917092656.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/xarutelo.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/45693082057.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/40415229712.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/84577977403.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/temiwuvosapuvenovuj.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/jafazazu.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/66932205547.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/miriwadexodelikekibupog.pdfIn PDF document text
    • http://industrialdevices.in/uploads/retimezawilap.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/29718219105.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/fusezikob.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/fisubege.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/wezibamajil.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/tumanidopuja.pdfIn PDF document text
    • https://soechi.id/userfiles/file/4681801660.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/tevivijoti.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0cf94ca7e---gomaxaguzeboresowuvit.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109170916484416.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/bugevikosopudar.pdfIn PDF document text
    • http://maxbrio.kr/files/files/nolonoma.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/57557495265.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/rosokopitixa.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_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 10884 bytes
SHA-256: 709c10a72f48d3bb8df1c3f4df107fc2adbf5508e42e85910f387936ac67d2dd
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 17572 bytes
SHA-256: 6acc339fca889c63e2a30f9a49852d6f9eab3399e4e60ae1fb31905cf761485f
font_02_sfnt_off0001344c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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