Malicious PDF — malware analysis report

Static analysis result for SHA-256 472d87483a312f5a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 13:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 30ff21084595c27f560bc948828be925 SHA-1: a771c090d6086f5194bd417875b4e134c4febeff SHA-256: 472d87483a312f5a15b743530a1f301056e906a71c2d5744709cb089f7b64851
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to malicious sites or download further payloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://beta.nhatthiengroup.com/files/uploaded/files/6889418107.pdf In PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/58616889947.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/pabasawenolisegoganijeda.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/wulopok.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210914110029.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/fesagekamiginevuxaje.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/53652599929.pdfIn PDF document text
    • https://equimat-cheval.fr/file/96367009714.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/91210563175.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/63963416664.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/058c5396a7ea2bb3565d9fda9c958a68/jatasojewudadaxetuw.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/52790835741.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/vadomuxufekekisaweji.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vizefuvegiboviniwomefu.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/zesizalaj.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/nowozadobaze.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/81718790025.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902231156741164.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/zupewekixoneji.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/nuzedigisuxodonuwokul.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/gamunokozaxu.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/35566774468.pdfIn PDF document text
    • http://synfarm.com/upload/files/75215578927.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/pikibigifekapal.pdfIn PDF document text
    • https://designclarf.it/file/95672739950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=video+for+kik+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_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 18168 bytes
SHA-256: 4ca49b037de3cc25fc44ebe62923e5fa65588cfb8fcbcdee2041540b1d8a91ab
font_01_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 10136 bytes
SHA-256: 2643a372f22f125f5913dab914c4685a1d5a94d4032c65659356b6c4d0f49c8b