Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9f5b10cee7456d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 01:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 660a2b2ed5219fd054e1f9f6b4d1308d SHA-1: adaa00f2337fad18cd2650fb110fcc2f9f18a99b SHA-256: 5e9f5b10cee7456d1bc1ed0a7bc973c532b802d89f5a1f35476fa0426172ec9e
66 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier as malicious and contains numerous embedded URLs, many pointing to unknown domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct, potentially disposable hosts to host linked content, suggesting a scheme to distribute or redirect to other malicious files. The presence of external URIs and the link farm behavior strongly suggest an attempt to lure users to malicious content, aligning with spearphishing and malicious link tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 4

  • 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 http://budapesticukraszdak.hu/userfiles/files/57241564665.pdf In PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613da426628a6---83010534557.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/98145856568.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/wivifugukaxagumik.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/24414569869.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/61222165120.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/jeterus.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/68539808823.pdfIn PDF document text
    • http://rcot.by/pics/files/zesatubagew.pdfIn PDF document text
    • http://agilesolutions.in/uploads/75179134310.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/wunelojog.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/xevafaropesuxaza.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/pukunitupibal.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/borupesebafolapom.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/gegupuk.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/58725366364.pdfIn PDF document text
    • https://haidangpc.com/contents/files/3757702703.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/26058771962.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/tefodetosoguz.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/84658874389.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/fatato.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/74400327330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=asphalt+8+moddedPDF link annotation
    • 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_off0000c456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 10552 bytes
SHA-256: e681b551e41477a9ff2aa268b493311a58f4aca262703f29bba179c8d03d01e9
font_02_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 17004 bytes
SHA-256: 8b4d54b2f79480f71833e8010e863a9105f0a8e6da13a471a081857cbee2c3b0