Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ff5cb10776b2aa…

MALICIOUS

PDF

111.5 KB Created: 2021-09-13 15:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70d422c23da39978ce07ce2deffbd3a5 SHA-1: 93ae8f7740c146fa0d40e2a59ac670762c747eee SHA-256: 62ff5cb10776b2aa1f6145213c76e058a5100afa421ed00a67fe9fce1f95893a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, indicating a link farm or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score confirm the malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://goang-hann.com/uploads/files/202109131819092901.pdf In PDF document text
    • http://champagne-marc-chauvet.com/images/files/badulenalu.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/58925557598.pdfIn PDF document text
    • https://grnca.org/img/files/files/dokedupaturukegimif.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/duguwudavunuwenoxijalaje.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210911124524.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/liriwofitalebedakelasovo.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/nufafusivu.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/nijama.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/34619224077.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109091622591342.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/94612853315.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/tujorisuwumon.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/rexojidalofa.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/mefamijotezika.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/gafoxuxize.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/13703691693.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/54168678753.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/midoxob.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/72367344866.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/94398780277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kodi+build+apkPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef55a33c21---78238886197.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
stream_005_off00018052.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18052 18544 bytes
SHA-256: bcfc9c55369c35c6426a2c16e7a6c087f365bbc0504f349345c93036b6b5dc5d
font_00_sfnt_off000151ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151ED 10108 bytes
SHA-256: c2248835df4d63e3abff1ec436d521f3798eae2642e592947327f4c207eb2710
font_01_sfnt_off00016840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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