Malicious PDF — malware analysis report

Static analysis result for SHA-256 f478260334af67f4…

MALICIOUS

PDF

75.0 KB Created: 2021-09-23 05:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c8934c27842aa839f11d2af2d64e8dc SHA-1: 759c0a89a33e00847928503677499425da257aed SHA-256: f478260334af67f48bf6e8a0832ae3335019c15a2ee5f0862f07138c98e68b7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of embedded URLs pointing to various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. No scripts were extracted, but the primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=tamil+mp3+songs+app PDF link annotation
    • https://ropaalmayoreo.com/images/userfiles/file/48362276774.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210903225352.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/depuwowome.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/votolupixibirigev.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/68641383915.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/tuvajen.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/xujef.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/22272214045.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/fomejezasi.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///putaxupuduzexo.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/nexugixupibovinofesi.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/xiseliminibib.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/13635015722.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/7832627677.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109100457013955.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410d60926ff---patabifenuxajilog.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/pogamowagusipu.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/37703269727.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/gugalifovijoxanofil.pdfIn PDF document text
    • http://surausa.com/uploads/files/fakomukeb.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/98462754437.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/dujeresazapewu.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_off0000c2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AA 17016 bytes
SHA-256: 54eaed1f02be1cf60d819b2ce995a22cd1887a64130a588eb9af2ed7df985639
font_01_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 10400 bytes
SHA-256: efe731950dd65ca827ca5289d091ea491396d0ac566a73134df4baf4b81430d7

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