Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4afef929f92b1d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 13:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e45b727d4a65166c44cfc75b2e2d3b67 SHA-1: 28d1ec458c6b3e633df364b9e39b7b7ac8c2d3e8 SHA-256: 1e4afef929f92b1d8ebe0a12ae7cbfc408e383615c28c092687b7caf42d7691e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, including one pointing to 'allytemp.ru', suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=smashing+four+hack+ios PDF link annotation
    • http://phongkhamthienhoa.vn/images/files/dafupuvoduzufefulirol.pdfIn PDF document text
    • http://retailcop.ca/files/medonibaxuw.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/xenotowimixajoxegoli.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/tatevasonapisodewi.pdfIn PDF document text
    • http://home-plast.ru/foto/files/dawejukuwenamopatelus.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/88585634217.pdfIn PDF document text
    • http://soles2walk.cz/data/file/zojijafebujafebazaliwe.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/mokawovoraxaresawatobif.pdfIn PDF document text
    • https://asiapharma.la/files/files/jilitidopusijuju.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/merexazopinopewuzinivew.pdfIn PDF document text
    • https://netlandschool.cl/files/lilixikimitipugifudoturaw.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/rotigiputise.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f31945b9---sutorobino.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/wuxogiwonib.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/23463487284.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/23123927474.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/larikokipisedesopafonazu.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/daxawivogifaxunarubodebus.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/72442761248.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a1fc9806fd488aa2be73abb5e0f075df/dofekasawizat.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/xotiregedosab.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/60279849496.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109110300572446.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/zetalifomipibikegol.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_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 17896 bytes
SHA-256: 7b60b8fa6ad25910a530736eb4ce1c1392124111574a63ca8c287b6f6ccecc28
font_01_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 10776 bytes
SHA-256: d1608f71f52cf4d673e40e70923a7161844a2c9a4a632123c607dccb470a32e4
font_02_sfnt_off00011a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1