Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc402a698bb6aae1…

MALICIOUS

PDF

85.1 KB Created: 2021-09-24 00:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08a58bba4e35d99b5c9254804873760f SHA-1: 30a7a4c40199662af6bb88662431fe1ab9dc356f SHA-256: dc402a698bb6aae1277fe52f9a43b9b2a7c1932bbd23919e06ba68eebc105c50
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to download further malware or engage in phishing. The embedded JavaScript is likely responsible for executing the malicious actions or facilitating the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hongphuc.vn/userfiles/file/93704744342.pdf In PDF document text
    • http://foodzipo.com/uploads/userfiles/files/wivimete.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/70077150447.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/aa80095c33bce5965a6e7d7b2ed18e43/43326652628.pdfIn PDF document text
    • https://redac.ch/upload/guxikose.pdfIn PDF document text
    • http://aprt1day.ru/file/rovonafawebazivegi.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/vavuzubal.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/nuxerilewotutawefivofu.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/14052469049.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/zubedilazagezerim.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/tefizojojegebot.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/wuguseledusuniwil.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/tagetoberimorutudusokap.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/97031667534.pdfIn PDF document text
    • http://analhospital.net/file/files/19562698500.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/30188294098.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/gigeximazotawun.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/59928817458.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161360a0159349---dibatesaxadalepu.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/41528725769.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/bekuvilovorojoko.pdfIn PDF document text
    • https://shibbirs.com/media/files/43007640964.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/68540820480.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/kafapixag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=you+cut+app+download+apkPDF 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_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 18236 bytes
SHA-256: 84cfcc92de68d6c6920d2a3e10ecbce76383c9fbf252a4e60252ec1a63271477
font_01_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9D 10276 bytes
SHA-256: 40ff02791946522e72bd0452c57b27675d2574ab92162d61825f2c4130d95fd3