Malicious PDF — malware analysis report

Static analysis result for SHA-256 356947bf02d13d77…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 02:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d48a0345e4778fc9eae6d272aed3b96 SHA-1: a7b6f4bd989ec8fe8e578d32e785beebf0fccd49 SHA-256: 356947bf02d13d7776a9371673ea24b3ca2d9fdcfc9484b3b751737848de65d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly indicate malicious intent, likely to trick users into downloading malware. While no scripts were explicitly extracted, the structure and heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fobosgrunt.ru/files/ckfinder/files/83934928432.pdf In PDF document text
    • https://csp-pub.com/stockages/files/verokigoma.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/46833458003.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/5351799605.pdfIn PDF document text
    • http://client.diffuse.info/files/xawolakoriladojazero.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/xanutixuvolopigogulevopiw.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/beporinesikutikazodovu.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/lajufogafak.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/bumironefub.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/83289149187.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e42c66d4a---demezofibigojawonuri.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/75591250148.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210906_111711.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/8737356054.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/31041521834.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/muzep.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/38870695791.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/4955548036.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/lomise.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/80889348855.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/64311871264.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/93477528288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=secret+neighbor+apk+android+downloadPDF 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_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 20804 bytes
SHA-256: b562f816c81bd1a769085a00fce5f0c3398f8db6a05de428c95abcfef06bcdcb
font_01_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 11016 bytes
SHA-256: 409bace12d70c1801da61682e62699bc568cc704a5701b944b96ed7ad5feb25e
font_02_sfnt_off000132b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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