Malicious PDF — malware analysis report

Static analysis result for SHA-256 c530647efa9625cb…

MALICIOUS

PDF

75.2 KB Created: 2021-09-24 21:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dc865cdeb27fcbb8be4da5305d6ade5 SHA-1: 8057cef07c3d93f7f64c41b90e4ff19e9e186b64 SHA-256: c530647efa9625cb5c395ceb27083fc3c9c78b60705f08c667954f1e16167224
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

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 http://motoren-adachi.com/js/upload/files/gunexetajolugisokazigemal.pdf
    • http://taociren.com/upload/file/21091014375566412734jkpo3n1esf.pdf
    • http://videlec.be/ressource/file/susob.pdf
    • http://thesciencenetwork.org/uploads/files/sofila.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4148ebf44---8532897644.pdf
    • http://www.anclupnapoli.it/userfiles/file/30193510433.pdf
    • http://kcntanduc.vn/img_duhoc/files/rotejuvudowigup.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/fadatejiz.pdf
    • http://jar-ted.pl/file/vuwatosaporewugomivida.pdf
    • http://naturestuff.nl/siteimages/file/levep.pdf
    • http://leeclinic.kr/userData/board/file/45271049973.pdf
    • http://sung1.com/upload/files/56699784238.pdf
    • http://farmandari-sarvestan.ir/images/news/files/92750902707.pdf
    • http://diamant-x.sk/UserFiles/file/buxadizogigegimufuxexowaw.pdf
    • http://laiyi-art.com/userfiles/file/75165485002.pdf
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/60869334380.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/26060390453.pdf
    • http://tubietelbar.hu/uploadfile/55350252309.pdf
    • https://lingchuanfloor.com/app/webroot/userfiles/files/kojazobijokozagadimulolew.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/10737913448.pdf
    • https://advantage.ee/media/contents/file/liwetiwuberapibuburome.pdf
    • https://dreptultau.hotnews.md/upload/userfiles/files/mejezagesod.pdf
    • http://matsusushionline.com/uploads/files/sapufuji.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=doppler+equation+for+frequency
    • https://www.posluh.hr/ckfinder/userfiles/files/96459708507.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc28.bin
88f2ed329ebd4c7de22c1c5eaf5d97eecb16b67f7b1843ca1ce95a7bcf53ab92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC28 19008 bytes
font_01_sfnt_off0000ee38.bin
dca7450379fcbc002d4f4a0c8889a7481a24cc22413c448d16c12bff60498c77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 10664 bytes
font_02_sfnt_off000106c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 16792 bytes

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