Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b21dceb892389bb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 06:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2d42b1977d93a6bcd41fefc4385a704 SHA-1: 85206ec5984144552d0ffbb1d84afaf5e80a5887 SHA-256: 6b21dceb892389bb90b3bfbf7adc3fad7648ad74e0fe94ec4603db7132c7c802
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of a link farm with numerous external URIs, many hosted on disposable domains, suggests an attempt to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://selmanoglusigorta.com/userfiles/file/romuduxu.pdf In PDF document text
    • http://tzsunup.com/upload/28396060740.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/58756377447.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/lukowuzusi.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/28a6e6214ec5b8d650845301de0ec35a.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/53976614090.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/89037445895.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c399b6e79---bemetetowimipapege.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631106037mirorokiso.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132c76cd7233---lebonaxiputamogoto.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/17661076431.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/dirulugipez.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/mowanerumipubijipivodimus.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tevutozu.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/54851321796.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/zobisexilopuje.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/javavefukubozenedep.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/63191807684.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210903_D13FBC300F482C73.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/nuderite.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/nuvabu.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/1946832939.pdfIn PDF document text
    • https://tekmaker.com/upload/files/wopozekepawajadad.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/74385174047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=top+notch+1a+third+edition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000bcbc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBCBC 17672 bytes
SHA-256: 8b117ad06c0f370e479ae65922fa674925c28de43aedd03750b2f3f9e252ded1
font_01_sfnt_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 10520 bytes
SHA-256: 22ae79c7546ae43c7859bd8307b9f9848ba73d68b65f8e3a794d241995ce5ab3
font_02_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 20424 bytes
SHA-256: 685e1d029c2549149437cc6fcc5fe8298cfc1d3088fb06e3316fdf6ec5251f0c
font_03_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1