Malicious PDF — malware analysis report

Static analysis result for SHA-256 a153a5f7813a2aa6…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 12:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 287597b478e74f81edc2dae6c1c31576 SHA-1: b8c9c484a2acd70a369e5697ee4a3f79b17f010e SHA-256: a153a5f7813a2aa655385f6075433f47b5f6702e451259402da4b1709a5d9b94
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier. It employs a screenshot lure, typical of phishing, and contains embedded JavaScript. The document also functions as a link farm, directing users to numerous external URLs, some of which are hosted on potentially disposable domains, increasing the likelihood of a malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inprovitcaribe.com/ckfinder/userfiles/files/43909854903.pdf In PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12986186227.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/18889940099.pdfIn PDF document text
    • http://kleiberit.ru/files/file/22554137031.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/28646396291.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/sokajuke.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/46229975846.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/69905251123.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/1685837611.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/59427800960.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202191195024503.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/50038206916.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/26093337557.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/dadbc533fa6792ffdea19b5b10c1f53b/12239598781.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/88535851365.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/kubabilurefusakefe.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/22624359216.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/13112480959.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/melizinasusener.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/rilikujid.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/60983482922.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/nonuwarabusujitawagup.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/75546076300.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/22653083179.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5edb4538b205f574619a0d354f563226/53174143154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+a+zip+file+androidPDF link annotation
    • 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_off0000b419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2B 14388 bytes
SHA-256: 253fbd92826977ff368432325147da9b083aff8c6f82f0fb6fc586eacdd5c1d9
font_02_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 10720 bytes
SHA-256: e09377b9f5d43a0efdb5c9646730e56bc7c32972d5d695521913ae25fd9f115d