Malicious PDF — malware analysis report

Static analysis result for SHA-256 293f1853e6bbe3e6…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 16:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e1a7c8e1e178b8e6512e4be546564f4 SHA-1: 5ee199be4496c0d3f82b7ae2a58541bbc9e5a2ad SHA-256: 293f1853e6bbe3e6219ca8daa76f8a5384611f43be99b9cd820cda2fa4c7b141
66 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains numerous external URLs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to redirect users to malicious sites, potentially for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest a spearphishing attachment used to drive traffic to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 4

  • 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 https://huntic.ru/uplcv?utm_term=organic+chemistry+klein+3rd+edition+pdf PDF link annotation
    • https://lomasdelaweb.com/userfiles/2008.09/file/31512202636.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/8217830503.pdfIn PDF document text
    • https://alev.az/userfiles/file/84961609869.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/47714332689.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/99fd112a92c938a8ba7d916c72df33ac/58736696417.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/61737642930.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161324956565a6---mirifofuzeno.pdfIn PDF document text
    • https://petikdaun.com/contents/files/sedapedofebin.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/tapatuselib.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2eec844c2---dupolobafezuro.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/25118021170.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/rigonosirabub.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/pirerafubu.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/18999323820.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/51692963052.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/39687826132.pdfIn PDF document text
    • http://telecycling.info/files/file/46645282095.pdfIn PDF document text
    • https://ms02bet.net/contents/files/30142149093.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/degewakafusoxivolesufe.pdfIn PDF document text
    • http://anpo.vn/upload/files/19952466353.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/614018b6ef08e.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/nusomefurelole.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/nepexarotemepugobot.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/21488386082.pdfIn PDF document text
    • http://myphamasia.net/upload/files/bibuzekofadozaguvevevi.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/90899318719.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_off0000b99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B5 11472 bytes
SHA-256: 47cefb326bf539370245190f46d28b601a7b440fb5bb8e57105b10843aa100b9
font_02_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 16360 bytes
SHA-256: a4ac77f7a5d36534f8981468db614a77b376f8035f63bfbe9fb5dbfa1c5af032