Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3f665b2ad7ac4f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 00:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: bce61f1436fee60e1b50cf29b8e3938d SHA-1: cd8131ae5272627de7aac511a41b03a82f7ba2a8 SHA-256: ca3f665b2ad7ac4f14b207033949b27578d07f8ae3345f017c9b6b43e07605dd
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=free+among+us+download+windows PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161318a6111b89---nokavuzigipujokipofosawuf.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/masirozusuruwi.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/zifezolokoxadeloziluziz.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/9169054241.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/gojapufefivabilaxomej.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/1948670150.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/pilularewunajinubisegow.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/bapudikurojupobu.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/31685932123.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210907203202012.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/vevoxi.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/1873790404.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/wusifovomijutopalu.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/2840261720.pdfIn PDF document text
    • https://viettrungson.com/media/Files/70208163330.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/30835868878.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/wenosivevurinilen.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/tewewewadusozonejotosati.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/sobafutem.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/65547148576.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/40831464794.pdfIn PDF document text
    • https://medtek.vn/storage/file/zudavovu.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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 10656 bytes
SHA-256: f2d804921733c151d7467540bafe2ab54130e0f2a7866dd8aee9780767b193cc
font_02_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 16136 bytes
SHA-256: aa16a7ce631a5cea978864453f8c05256bcb67ae5f38620f2c6c266cdda5f57e