Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8158bcba7d2e85…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 14:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdd3b9192dae7c6b5242d2a269907c6e SHA-1: 1512d222bd484f266f588c8e954faadae97b8833 SHA-256: db8158bcba7d2e85d8d0f67d0b28698be91ac03d754e1a3668bb01f99bd0ba70
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous external URLs pointing to potentially malicious content. The PDF structure and embedded URIs suggest an attempt to redirect users to external sites, possibly for phishing or to download further malware. No scripts were extracted, but the presence of external links and the heuristic findings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2832

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://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

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