Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88005df6f89340d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 06:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6843caef84b2c2e54b4b8ce298d2b6b SHA-1: c49feb35a3cc45fd88c2685ef7280288a48d24a9 SHA-256: a88005df6f89340d28eb2d0925b277ca6b6d4d8cc39789290db05ebe9284edb5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to 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://pistant.ru/uplcv?utm_term=python+for+android+recipes PDF link annotation
    • http://hockjoohin.com/admin/uploads/file/gitukigukedalodexaboriv.pdfIn PDF document text
    • http://midel.me/userfiles/file/mugimizolajagizavifex.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/gotuveduvuvubosuvijijo.pdfIn PDF document text
    • https://orangerun.re/photo/files/pexorubopotawigafaraku.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/getidejisaxawaturokumigid.pdfIn PDF document text
    • http://medrea.ru/upload/files/58581865788.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/regubesikipa.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/91666022915.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/61642700358.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/molezodiv.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/2561318921.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/7848124981.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/94835694394.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/18447808961.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/79078611514.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/dapedibunikodajumili.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fopcc8jclqjrra4l7ufb0u85h1/87520341119.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/xoxewugu.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/84961867995.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/nironojivaz.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/36474080229.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cr6po2crmkqs9cnnsbqgpflt31/xujeniwagefogumipuzij.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/25076460281.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/kirowefubepure.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/20987574583.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_off0000b2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 10784 bytes
SHA-256: 4e03517524932b036b47b666929a4a71786e7eed3cf20bf855b3a1ab7a87a5ce
font_02_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 15076 bytes
SHA-256: 74f2b66c0008b2e62346cf586e6ad073a4fa0e4e346eb805d3f9a950e2dd507c