Malicious PDF — malware analysis report

Static analysis result for SHA-256 786f734128cdfddf…

MALICIOUS

PDF

73.7 KB Created: 2021-09-24 21:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84878c639c795d5b1cf802bc92c08333 SHA-1: b593c75d6d7e0e39ba6969728fa14e935eeeeb2e SHA-256: 786f734128cdfddf333568881902da5336217644453ca9b4ff0037125eca35b8
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs indicate a strong attempt to direct users to external, potentially malicious, sites. The ML classifier and ClamAV detection further support the malicious nature of this file, likely used as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://bodymason.com/user_uploads/files/daderajevubimexivemebodab.pdf In PDF document text
    • http://huzatfokozo.hu/editor_up/kitemarowukemoj.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/pawofuvivopopozoduzofeta.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/mukuradabuzuboviveforo.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/zimukopofuxuxusuwis.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/gakiradobomokinu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4c457961f2f29b4861f6dd78fce6efe4/bakijoxa.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/95793388739.pdfIn PDF document text
    • http://ciskmv.com/css/file/95113622545.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4160884ba0509759a77806d0a03577c1/xifegajoduletajeri.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/razojowij.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/gonejawexexaza.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/28338597095.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/90514240935.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/33596927001.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/46698781871.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/88042334351.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/wofisepes.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/vulofebipinudo.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/wutememaxik.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/66400143429.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/12899956701.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/vemaje.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/jolavadug.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/zonaxemetapuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=topfollow+app+unlimited+coinsPDF 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_off0000ba38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 17704 bytes
SHA-256: 4a5c5a4ab96aeb6f9d4e5cc81daade3978dd1ac09613b33c8a49394b89317555
font_02_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 10832 bytes
SHA-256: b1c44cb8b3013b4518adf154f6e736b3893cbf2e10205d2dd892b0eff01b383e