Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8f5a36d5ae6f56…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 11:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 657f0cd488debd39b76e360b5bc83176 SHA-1: d4993211e65d3e89d321ad32e2e03939e4dc4b66 SHA-256: ee8f5a36d5ae6f5655dfd4e30221fad3f416b280d3f46c58e2eb674250c3c135
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many of which point to other PDF files, suggesting a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution attempt. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eot.mn/uploads/userfiles/files/60144298966.pdf In PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/77609709811.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/9448320064.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/25954421062.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/zevafip.pdfIn PDF document text
    • http://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/82592118563.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/xubira.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/73443661508.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///gekijizexuxorifo.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/65471487383.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/noridokufo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613221b5437f7---fozegajobezomizirofom.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/39888669686.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/fuwidijebobemurawowa.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/30111351880.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/niralibepuvuguvib.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/duvojelofo.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/nilawo.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109121544239381.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/53504432865.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613732a859807---58329550290.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/labigakaziteluvemipi.pdfIn PDF document text
    • https://susta.vn/userfiles/file/5754774941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=apk+clash+of+clans+hack+2020PDF 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_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 10468 bytes
SHA-256: d7fa2f3d0593799043728fa59ec28493c86cea6183fea9620d1ef994590dc61c
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 18040 bytes
SHA-256: 7350eccbde2eb84f0f0335171231765de92b2cb2e8efc9755273145d6ff70fec
font_02_sfnt_off000127fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1