Malicious PDF — malware analysis report

Static analysis result for SHA-256 c719121d772d462b…

MALICIOUS

PDF

100.0 KB Created: 2021-09-16 07:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b461107f8c379f656e72951655fd329c SHA-1: 7927e25e6e5d5c7fdf9d212e1c7f6dc05e50106e SHA-256: c719121d772d462bf4ef9d499daf50809b9dcf34c11bc7e2ecedac25ab2dc7d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm or phishing lure. The PDF structure itself is also noted as a link farm, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=the+time+shifters+in+time+travel+movies+full PDF link annotation
    • http://arabstina.com/ckfinder/userfiles/files/84488287586.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/bejekaregikupawoba.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/vutakuwubobamajemedavufu.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/rajadizonowofixebim.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/12868696828.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/53506288177.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/670283c809bb6e4d893c835eb0cda035/megajamur.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/9922930897.pdfIn PDF document text
    • http://keacg.com/upload/files/dinugodupotilepuzu.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/nufefewusejat.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021921148598771.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/zixoronabupen.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/gasuriwafeteporode.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/48217711216.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/peluvedo.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/91566800562.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/88337299568.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/38619537159.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/35566973259.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/tonovifob.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50ed4a718---67547599886.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/ziwob.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/88421032785.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/salupeguzojefefirow.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_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001387a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387A 18936 bytes
SHA-256: 271900d4721171aab52a8c654ce3fbb5ab763e0e365496cced42ad9112479a06
font_02_sfnt_off00016a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A3E 10608 bytes
SHA-256: eed0e829be16d9e1a4ba7cb5ee7b3d582aafb0015c601da796e8a6360c0f909e

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