Malicious PDF — malware analysis report

Static analysis result for SHA-256 855a8235e70c2a3b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 04:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e1274e9df4f2dd7707a7ed85064cf958 SHA-1: afcd4e8d375bb50775fafa36a3288256e3c9430f SHA-256: 855a8235e70c2a3b848291cbfd9de9fa2a25b3f44a83e951a78894e1ca296c8f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are commonly used for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://clubselectionvoyages.com/images/file/54456630769.pdf In PDF document text
    • http://ndt-tl.ru/upload/file/16288706893.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/41335192432.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/foritoduwagab.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/71727037331.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/23201341850.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/32569067672.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/90527174385.pdfIn PDF document text
    • https://afma.pt/site/upload/file/13992970808.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/40iho4c9jqud5tjbi77roj001h/ladopim.pdfIn PDF document text
    • http://skupka54.ru/upload/m/94080345775.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/55415331723.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/wobavafimebijenarujukuw.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/refadaveraz.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/50004008026.pdfIn PDF document text
    • http://poliinc.com/upload/files/wigotidapusovazeb.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/1731508693.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/65037719062.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/67b6ec9d4fb1ac9dba356084fd6ef911/50593270071.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/31302428488.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/mibinixoz.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/mifonidowi.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/62519117668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+remove+swiftkey+keyboardPDF 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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 17416 bytes
SHA-256: f8af1d0769b56cff5bb2d5ddb673e1e07be12c14d110c4b8a04b774f4e7e3f6e
font_02_sfnt_off0001265a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265A 10856 bytes
SHA-256: 13d41742cf52fb1fed9ae8eb9291732985ffa629803b88c08ee438f0b3ee2870

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