Malicious PDF — malware analysis report

Static analysis result for SHA-256 301e31ddee0850dd…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 20:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a0e94aaf9ebc9b492a6252d75e6479c SHA-1: 7b3d9c30850bc906be58716b12e77a4961aae55b SHA-256: 301e31ddee0850ddbe064307dd6c21e3c2e75799eb2018a940d139fcd301b893
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://pixomot.ru/uplcv?utm_term=gta+san+andreas+mobile+free+android PDF link annotation
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140614f428ed---xejonesudukizujogovasukel.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/sususetiwurid.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/1575831238.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/6510435464.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210906234548.pdfIn PDF document text
    • https://polandpools.com/contents/files/rurokatobuwepejebosu.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/rukoxojelusexigoxelanej.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/toxenagimisut.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/luxox.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/bapepino.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/tefitilunijolukavipiwonap.pdfIn PDF document text
    • http://carszana.com/image/upload/File/35532210348.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/wagidalovoviv.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/92940200460.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/nusaxavibijiluworitud.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/zipopedebavi.pdfIn PDF document text
    • https://alev.az/userfiles/file/zobivizupafupuwitutisar.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613291421126a---43405632303.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/54414325918.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/bakesakakizares.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210914111237320799387.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/bizuxikivilomovaguzi.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/45225801950.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1631379380577.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_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 17448 bytes
SHA-256: f2a216b95842e5e88773079141a58cdf0e5049ea989989bad2525f08429633e9
font_02_sfnt_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 10696 bytes
SHA-256: 0e7bd1d624fbe326abd9025aa640b34d3fec2e71e140a54211ddd321eb297d78