Malicious PDF — malware analysis report

Static analysis result for SHA-256 accd3637255b6621…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 05:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 458ee98334984f42d00d20a114fa8819 SHA-1: f86f80ea89ae6faff6acaa8f2bf372bfa8ebee3e SHA-256: accd3637255b6621d9aa6b34dce0494a2ee2303ae4235e125c612160a704782e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous disposable domains, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=sans+addon+mcpe+download PDF link annotation
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/8fe55d5e87cca14b3710cc97f186b19d/52780475738.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/tazapo.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/liwelajuwi.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/18885060403.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/60786991555.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/23853906628.pdfIn PDF document text
    • http://klpa.net/userData/board/file/63253404895.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/54494245312.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/91753637181.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/68189250488.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/54915639951.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/1230007060.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/nuzawitivubavu.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/2931183777.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/lavikopevutema.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/78069213224.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/98250843399.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/84452040375.pdfIn PDF document text
    • http://dd-eng.com/files/files/fexebuxelefaginelolijuke.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/joxepubabigo.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/fezilez.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/kogodej.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dolisixazonoso.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_off0000c779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC779 10548 bytes
SHA-256: 2f382f652eeb5414c752746e5e37ebfe5dbdc52af1bad5062901212d2a920a53
font_01_sfnt_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 18616 bytes
SHA-256: 51f2e946393c71df94ffd71be9bc6e4cfd9fd50aadd3a105b92457a329fa48d0

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