Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff8862be8303e50…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 09:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85c9875dd4c92af1aa00a457247a5ce0 SHA-1: 806b139985841662d4c3da8123ae673e65ffb68b SHA-256: 8ff8862be8303e50f65790ee943dd3355f7b867c56295baa04f2d002e9405ccf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with one specifically identified as a lure for downloading an "apk". The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing or malware distribution site. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vinatech.com/userfiles/file/75018327798.pdf In PDF document text
    • http://isisthailand.org/file_media/file_image/file/fojomipoj.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/5388740190.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/72237139227.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/nabikulupag.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/91791380209.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/lobepo.pdfIn PDF document text
    • http://fullx.net/files/89329359495.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/85975358201.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/868714499.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/garatowosofoz.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/ratifimomekekoxafobo.pdfIn PDF document text
    • https://brs.jo/userfiles/files/wetudewizafinujage.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/tuxudolakavejumesakefe.pdfIn PDF document text
    • http://donghotam.com/luutru/files/50467323402.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613668a096c37---5726466274.pdfIn PDF document text
    • http://szhlfz.net/upload/19829225533.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/84698218538.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/webelamejozulizu.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/mipodobuwilutowomu.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/64808438575.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/5694643361.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/57999040177.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/46242940518.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/sabute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+stadium+2+apk+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_off0000be73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 10852 bytes
SHA-256: cf37046b93fd0edce3ae7b7912ecd0f6cbe4e31da63f4c3dcba469ff75de9823
font_02_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 17716 bytes
SHA-256: 7d6698f6d3894882a2853474dbe96318704badcb93feb4afad8cb9cb5ceb09a0