Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dd0d00b00ea4bf…

MALICIOUS

PDF

88.0 KB Created: 2021-09-09 09:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71d9137aeeab7693edf33112b4bceded SHA-1: 0d29e10695546553ad937ff7e7ac69415a85f575 SHA-256: 50dd0d00b00ea4bf98cb57569ffd95e27d63473aec4908fd099d3e5e9bb1be04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that form a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of these links and the heuristic identifying it as a 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a malicious purpose.

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://cructi.ru/uplcv?utm_term=most+hot+english+movies PDF link annotation
    • https://specializedfacilitymgt.com/public_html/userfiles/file/42067947546.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/mubuk.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/68510170952.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/81851885202.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/dff4f65725c0928c9ca4e0dda0a66606/guvubagaxevatebuzomoz.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/xewameg.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/bofes.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/42898995297.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/2335190916.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/43498925070.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cadd5d499---75619315363.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/sinede.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/28692568408.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/60328998526.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/63187056540.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/liwozigumajodasafosizaso.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/paroxobir.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/50587672344.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/41761846908.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/gepuxamowurilipexiris.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/19537627656.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/69899392158.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/61808757166.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/96911379538.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/koladoxomamomam.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/jonuk.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_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 19016 bytes
SHA-256: a92765b52893e8ffc3b6622081782afa1dc0bbb7c93d4968b44f47e6d8684e44
font_02_sfnt_off00013b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4A 10352 bytes
SHA-256: 62ac4ab990c6c447781a1509f3ebfb871a2a15c111326cf04a878fdf8dc243b3