Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fc557a80748cec…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 20:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b54534641b40296f081c65a1e7fcaf7 SHA-1: e9b0962747e6f13a631166e9bd027e7975b52fdd SHA-256: f4fc557a80748cec5cfb8aba72332a16e5753304f1cbc5d324dacb2c0c8f3633
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous external URIs, including one pointing to 'pixomot.ru', suggesting it's part of a phishing or malware distribution campaign. The PDF structure and embedded links indicate an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=my+phone+is+not+opening+apps PDF link annotation
    • https://lordoptika.hu/files/files/26636597845.pdfIn PDF document text
    • http://webursitet.org/Files/file/22925923681.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/disakubukejikudenupom.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/ronejoxofu.pdfIn PDF document text
    • http://client.diffuse.info/files/jukonuxit.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e38c2ca0de154c6aa3e4464d4ebae11b/87113482941.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/5842684090.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/detulovapu.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/kagokavotutosiva.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea11d204b7---jexefanufe.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/73890175890.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/28497092842.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/zuniz.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/savelekawiwamurudif.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/sisovajalamivugex.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/21440466342.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/54168747208.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74645034840.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/zavugozotemelu.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/guwejuv.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/1449589807.pdfIn PDF document text
    • https://buka.ru/sadm_files/33476709812.pdfIn PDF document text
    • https://ocw.tw/uploads/files/65746174139.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_off0000ae3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64F 16968 bytes
SHA-256: 60ca53b71221c715f5ce9a63a43d09b1d30a1e10afc631ef8127c8ab20a9d13e
font_02_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 10492 bytes
SHA-256: a565b24911adb8262c9bedfd9902a82ab1d6c393866110c22245046341a946c2

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