Malicious PDF — malware analysis report

Static analysis result for SHA-256 c354521be9e59a6b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-24 12:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 82a45555fc7969729427621e49863a8c SHA-1: bb2b5fd4bedd4646875f5644c63c3ce65984e211 SHA-256: c354521be9e59a6b298149b10ecbd9d634513f99b3697e584757290b29c9de08
154 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 appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=how+long+is+it+safe+to+leave+raw+chicken+out PDF link annotation
    • http://restaurant-lyons.fr/userfiles/file/37569094619.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/cplma0m2tt5ll3f6hc0mq0q13e/muwuxazatiku.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/vedenura.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/99161686045.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/31766810287.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/sugojosozezobute.pdfPDF link annotation
    • http://stin-verdon.fr/assets/Image/files/pubufazejupuloxuje.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/diruribamivalizib.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/nigesekalipelile.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/4171541432.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/70959472384.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/tekozoji.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/80596636723.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/lenekerosot.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161403d7a33446---92633129438.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/19313625154.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/72965383163.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/rodokafejojibajo.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/lowiroripiwuwug.pdfIn PDF document text
    • https://kimcert.org/E/file/20827769632.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/85464745359.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/wowopelodufawij.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/46850078906.pdfIn PDF document text
    • 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_off0000e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 16684 bytes
SHA-256: 1bc1b58719f5c9b6a8612269e8c82eefe6b838e9bd9cc6aadbb296384486d5ae
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 10952 bytes
SHA-256: dba9da824437d311eeddbf951da7b85899d27e5262db100bae3f957cf347d26d