Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bfbd306a204c02…

MALICIOUS

PDF

70.3 KB Created: 2021-09-18 10:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e54e19b18439985b6e241f703fc53006 SHA-1: 80282b2b14291d21a43a1594cdba70412b7d673b SHA-256: a9bfbd306a204c02fc44c83e359f09dfcd976e1c93cf80ae9d590707bfbe612e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, indicating an attempt to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The presence of embedded JavaScript, while not directly executed in this static analysis, points towards potential exploitation of PDF vulnerabilities for code execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://oniceh.ru/uplcv?utm_term=scary+stranger+3d+mod+apk+unlimited+money PDF link annotation
    • http://moiarchitekci.pl/pliki/file/buwevazologulusoxamifu.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/89180275613.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/53735712247.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/wamitanukitaponivonivox.pdfIn PDF document text
    • https://pcetravel.com/files/file/sojenoxejulipunuluwaw.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/xiboxevi.pdfIn PDF document text
    • http://gekon.net/userfiles/file/63329058031.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/kodevujowepofaj.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/dumojopojotagiwiw.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/99962887800.pdfIn PDF document text
    • http://kechengchem.com/upload/files/pobikil.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/22269507956.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dd2123a56c0a9b7774b7879f8d68d01/mitudivevadunuwomom.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/xuvaxipodedawukejubi.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/pejewa.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/tifedaw.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/gisumirubigajutategon.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/86caf4b1dbe562389ee6ea7f1e700cc7/gasobubokegese.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/78372358475.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/gogewaxujijaxixoxuv.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/fagus.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/mufelowufuvokimoviparine.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/17223868154.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091807461714.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/90501695377.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/42397202941.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_off0000b336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB336 11408 bytes
SHA-256: d272b68f37559373fe7059776598a995037c8ea254fed8baddb03db2d81832e4
font_01_sfnt_off0000cdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 14936 bytes
SHA-256: 692012cd8296ec4fcab0ec51394aa57128c2754790be02283814f85fb423cd6f