Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd52872878f4e2a3…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 07:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f82135e0d06b9b207a9cd5db92a04054 SHA-1: 5d2f2d68bac72cbd7d5c645dbf11c0858376eb51 SHA-256: fd52872878f4e2a3499a374c344f85062ee8436dc9c79b8649a4974b20ced2b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

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://synerhu.ru/uplcv?utm_term=iphone+live+wallpaper+apk PDF link annotation
    • https://aymexco.eu/ckfinder/userfiles/files/12153053233.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waselagitikikowemo.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/60357670959.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/868714499.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4740287c7---nowutukajiroz.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/kidiruzira.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/65045642743.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/25473393766.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/dulajofukutazodo.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/wogap.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/nekesewudozis.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/nixisapikexegovoxu.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/28914912090.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/wiguxi.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/8322779145.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/rowiguvitofigaxito.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/lejewiga.pdfIn PDF document text
    • http://giahung.tincorner.com/uploads/files/87564692902.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631330829.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/72299488209.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/serigaresidifu.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/8657716053.pdfIn PDF document text
    • http://secondary.oksalesstore.com/uploads/assets/files/suworixu.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/lasowivowofugupo.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_off0000b2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 15660 bytes
SHA-256: 78daa513c99ee4debd608ec977f2a456d6a9cfd98da8e99a170915841fcda107
font_01_sfnt_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 10276 bytes
SHA-256: a6acce01671840a67c2ba793e302cf30eca0177954aa706261ea99136ea34a08
font_02_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1