Malicious PDF — malware analysis report

Static analysis result for SHA-256 de38b91ed41afe3a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 06:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7f036fea16db5b9be9c7844df7f608bc SHA-1: 1978a2d95a77efe228b0a8657b0ee1dfab179c8e SHA-256: de38b91ed41afe3a8095ea46059e81732ee2b568be912ca8f3a6bb9db0bd5ff6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a high heuristic score for being a link farm on disposable hosting. The PDF structure and embedded content suggest it is intended to redirect users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://begues.mobi/userfiles/file/totovusovugejiloje.pdf In PDF document text
    • https://htchninc.com/d/files/golikesinikokaba.pdfIn PDF document text
    • http://vhshf.de/File/mokipu.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210910_C47EFDEBDDDA3778.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/63182272830.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210916215325.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/65079778509.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/japidin.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ccfd2e614---vuvilewogaperepa.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/rawiboxanupifox.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/34287980478.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/tonunujorotelekozamoj.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/79942880023.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/nolunoboxivifake.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/mukejebejuxojunulavar.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/kasub.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/sejuloxiwowegulaxapata.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/puvasiluvus.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/82079595728.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/22646934579.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/doparerojenagetofo.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/49865796545.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/96e4a6af4eef53639187b7751aa453be/sagenepotujazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=music+codes+for+brookhavenPDF 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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 17856 bytes
SHA-256: 720c3de6bbfe945f418cff2898fc04f38d625255061034604dc50e7b2c4eb940
font_02_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 10820 bytes
SHA-256: a842b1c77606dcece486ce96a3597251b375ec9288ec882f3b12070c80c335ce

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