Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc133e9c4f80098c…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 03:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4a08239c0b13b37e7bcf5baf4e5d654 SHA-1: de82c8c60c6251bffeeb1e91d31bc661e76d44f8 SHA-256: fc133e9c4f80098cfe7d7449976d566655a189ca65e2faf9ba626a45d5b6e2cb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to malicious sites or download further payloads. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://abogadosaccidentealicante.centralcms.cloud/galeria/files/moruvekusonosabipid.pdf In PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/losigutafakadifu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2m907j07hbv7q1v3p2hn7font3/fuxifibosopesiwu.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/72083172347.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/busobojura.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/32061559211.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/vuvajovew.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/kipuvefikuwugobuka.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/9886172035.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/40159656940.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/sozagezusekonovofutoju.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210916025836.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140009d67ee5---nuxal.pdfIn PDF document text
    • http://zeci.nl/im/image/zitinudetawijotipi.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/pakusegewaku.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/nibebuberinoxolana.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/vozolozaxisipolewokugixis.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/tilekawubifefivax.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/2273676045.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/gosumugavofun.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631687681.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/45946097933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=my+fonts+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_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 18064 bytes
SHA-256: d33dc48c091f9f7230a03a1be0628f6cd6e6512a8d41f4919a55ce3a0fc34957
font_01_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 10180 bytes
SHA-256: edd8c313bf2f65dd1dda8a7fde558714d5dc23619900afa7f9275e808e1a4d2e