Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd62803cd74e56c…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 14:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2db57ff69bba0074afb4546a96476218 SHA-1: cfd6e0710bbed591aa6863d9042c46d704ceb442 SHA-256: 4dd62803cd74e56c68c308a6e1f18fdee21881283427c14fb1f4bb886cf00686
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=apps+to+watch+premier+league+live PDF link annotation
    • http://anhuicrew.com/upload_fck/file/2021-9-9/20210909003704614042.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/remonowutuziwe.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/15574339414.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/25687726865.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/2648797565.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/62386431389.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/64986142653.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/serafapit.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/19475028580.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/tusomifufuxolotifoxaxa.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/fifemofefuloj.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1febe7118---jigujetaviweda.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/82734598433.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/kujuvesonunakofuzumel.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/25021485331.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/55334280982.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/30347112465.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210907192338844.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/kigutipem.pdfIn PDF document text
    • http://hingliltd.com/userfiles/tofiwalevuben.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/kovawevu.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/37263970394.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/47358925169.pdfIn PDF document text
    • http://195exim.com/datas/files/17822875990.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_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 17460 bytes
SHA-256: a0269b312aa24733d34074a3c110c511ed1e113a5c7ce69c76178540a273b43b
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 10948 bytes
SHA-256: 47174d7a3b9fc6b6f8263300c852ad38d069590760a8b6217f61a1c40c0b0242