Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9224635510c56c…

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 04:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dc5b0cd1dadb67c2eb36f51ec8d126c4 SHA-1: 48451e4e74e5491407c384c77552eedabea6416e SHA-256: 9b9224635510c56cf6fb67bed6bf534b7339e966db45becd72d17fcf1d76df97
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malicious download lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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 http://dcbestwings.com/uploads/files/zusisorofawapedemabo.pdf In PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/vadosidurowugumafer.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/88839430468.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/60805744256.pdfIn PDF document text
    • http://agro-partner.com/Image/files/45201419186.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/94003064454.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/88985501978.pdfIn PDF document text
    • https://viceda.com/userfiles/file/karovuvos.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7f7dcf617579296b2289aa377832bc17/4537050815.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/49695528790.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/vagijejotita.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/buwogotinujogaroxi.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/10994861046.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/vaxuwixatexowebago.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/29303884453.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/domibidepezokazamu.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109161849218824.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02ebbe3251a125fa04131d1f5e178727/gejulasasazorawikuxew.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/sodamusegupu.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/1548253695.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/mafadeluketu.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/kimamasenararib.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/xesebanivolisofe.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/wovojosag.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/46842312340.pdfIn PDF document text
    • https://cargobull.cz/res/file/28712145710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+injustice+2+modPDF 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_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 16724 bytes
SHA-256: 769998b036256a1c90456e6a8a1af8da4574a59102f07c3a205d10072672e532
font_01_sfnt_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 10868 bytes
SHA-256: 287418b3026646f9152cc0634a2ce121f9dcd6f294dc4655ad8ae3c856b6ee06