Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ae619a4413ef6e…

MALICIOUS

PDF

81.4 KB Created: 2021-10-06 21:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cbc119a46176643a5cf68445b61ed5b4 SHA-1: f854e1d159f284b44c4c1c11234a3284b641d0c3 SHA-256: c0ae619a4413ef6e754c5023cdb24ea678aa7c61112df6e193da927e102e2f59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. The presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=head+cupping+therapy PDF link annotation
    • http://bfr-bialapodlaska.pl/userfiles/file/64275968301.pdfIn PDF document text
    • http://splogservice.ru/content/file/59612910362.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210921_030038_2308.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/vigov.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219110355.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/ribesixajudetimed.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/55818575078.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/25854695843.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/88402705246.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/89244045552.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/timokobosugazudifetetox.pdfIn PDF document text
    • http://edituj.cz/res/file/39524865772.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/jibalopobizatofunogeber.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/37604984041.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/xuwoguxisojosotawovalu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161431cab245ca---lonumesa.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/zevikivividibima.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/26304495209.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/valuxanobibinakuwo.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109242051214190.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/29191252441.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_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 18728 bytes
SHA-256: 6841290f0afdf3e0ca66ab36c6c33af095f60524da4f7ed93f510bcbf5e5dd52
font_01_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 10664 bytes
SHA-256: 36c3b589bbd25863261a5335062c3416c3486286355d5f6b59c7d26f6f65129c

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