Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd43a3fa7adc8145…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 13:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a30a1f4a83688e8e2e1089c9e57e19c SHA-1: c1a2f1a301b4c2498a98da3645be0b19b78ea4f7 SHA-256: bd43a3fa7adc814535a8a22917b3f0106cf5155f4b9daa8a4a9b3efedf128133
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=3x+video+convert+download+software+free+download PDF link annotation
    • http://severstroysnab.ru/userfiles/file/91614754923.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/97365133798.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613099e216cf2---neluwepu.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/dalopevavugejerali.pdfIn PDF document text
    • https://partetesal.ir/data/file/58085310383.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/lagunokuwebegokupom.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/713f868f88f925b773fc9a69cb5ee8ef/tinodiwodajevofanidota.pdfIn PDF document text
    • http://onelove.cz/file/sirawazubepaj.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/tedapozol.pdfIn PDF document text
    • http://pk.mo/userfiles/file/39117658067.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/12312708225.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/19347591356137e9af9b3d7.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/nisofonujibaponalevon.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/55561590165.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/bepafag.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/rolixozoposum.pdfIn PDF document text
    • https://protrialse.eu/files/files/beximi.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/kanudokibidalefuzijar.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/34350636203.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/wagovarowowinibuzorawuxe.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/55201609608.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_off0000d36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 17004 bytes
SHA-256: 2346e61dec3dbe91c943df5f91d8d7da41c19faedc49d014084193e010f1619f
font_01_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 10800 bytes
SHA-256: 57417d2b740fcdf66d4d5b85456bac7485bbe6b27fc62a6492a60721f76bf8ff
font_02_sfnt_off000118cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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