Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df726ee628863cf…

MALICIOUS

PDF

76.1 KB Created: 2021-03-23 14:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9a0db36cbca1fc7df6772026e34f012f SHA-1: a150a341c5d33b40a8dbeff5f204aaf33f0f38a4 SHA-256: 9df726ee628863cf3592bad31f376e9f2312f4d2ae75de5af6414b49ad44acdc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV identified the file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and a link farm indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/award?keyword=acute+myeloid+leukemia+review+article+pdf PDF link annotation
    • http://chtotakoebezuz.biz/gexomumixadikekoxboshx.pdfIn PDF document text
    • http://afracheat1.xyz/vaxevemaduxalugobakeruivmqw.pdfIn PDF document text
    • http://zanartcc.net/sabozolodixi38xcz.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/82d1e49b7.pdfIn PDF document text
    • http://romeoplanet.club/movie_4_android_southgo8av.pdfIn PDF document text
    • https://rikovikoxeko.weebly.com/uploads/1/3/2/7/132740842/tajugomivo-bivenalawem-gijoru.pdfIn PDF document text
    • http://alania365.ru/facebook.com_saved_items8h93m.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/xojadewuxuperidadij.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/foxigelutok_sanadikib.pdfIn PDF document text
    • https://wavuzujez.weebly.com/uploads/1/3/1/4/131406867/5781806.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/36f304c606c2b8.pdfIn PDF document text
    • http://znakomstva18x.site/craftsman_tool_set_cmmt992061mksa.pdfIn PDF document text
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/jijodi.pdfIn PDF document text
    • https://pibitodasako.weebly.com/uploads/1/3/0/9/130969140/4612706.pdfIn PDF document text
    • https://jisuzinux.weebly.com/uploads/1/3/4/6/134671095/3574035.pdfIn PDF document text
    • http://esclick.pro/823775543772mezb.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/9312823.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/daginetevomozora.pdfIn PDF document text
    • http://esparks.ru/diary_book_reportxq5wm.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/peduxi-larenabivipupuz-zuxibasiwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ginutu/xogotunopamutalinezabuvuz.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/char-broil_oil_less_fryer_recipes.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 5432 bytes
SHA-256: ad28462235002ffce1ca0753921a09e9d9c482f8583bd3bfacda901afc733464
font_01_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 10836 bytes
SHA-256: cc1d23405a2fd7354c02ac12a4e8c337489d461850d3b1730f019fe4fa04a9ed