Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddddd2975e119b5…

MALICIOUS

PDF

101.7 KB Created: 2021-09-14 00:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5235eb98cab085e32914146294d4c9ab SHA-1: 0f996a277a586229efb638c0905ef55bbb2f1ec0 SHA-256: 1ddddd2975e119b53a7e1f324561c42d85ce01cc4a374e2bb400514cceb747c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://slsnn.ru/content/files/93313511012.pdf In PDF document text
    • http://jinruily.com/UploadFile/file/20210910234748696.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/vixigajufazak.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/11795655803.pdfIn PDF document text
    • https://masukpt1.com/contents/files/20881903277.pdfIn PDF document text
    • http://e-district.org/userfiles/file/47966588290.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/55722211832.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/welikafedewafapigux.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/xirasejufavonufixibavudid.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/gexadaxixezuw.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf3f4aebb---53867567902.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/sagubulutev.pdfIn PDF document text
    • http://prosquash.by/data/kulibepefudeko.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/soxegirerijatojenawix.pdfIn PDF document text
    • http://sgpeo.pl/users/file/96445211269.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090202173529.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/99219388510.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/47086300950.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/90487007112.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/77859916887.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/rewiwopita.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109031023049835.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/56802792522.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/17729212008.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109040416043563.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/bizefezawudidezotuzol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=molly%27s+pilgrim+pdfPDF 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_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 18840 bytes
SHA-256: 5e72fa44cc3115360512b997c46f7f98a65830a38fe8f2113d630c7c57b46410
font_01_sfnt_off000159b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000171d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171D0 10484 bytes
SHA-256: 1f995e2950401d5318b327ac9a38647bf7a6409d9b2cb3cdd9dab1076817621b