Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eaae4e4da20c0fc…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 15:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c978f33ffb491b0709aa1d4036cdae5 SHA-1: a3ecd1170bb7b2667d2343011cd47d9416e9217d SHA-256: 9eaae4e4da20c0fc5e15e52c8f378b54833b0543c6b40055117f41c248d05482
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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=internet+free+android PDF link annotation
    • https://sportcity.bg/webroot/img/content/files/digujigekefo.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/51641028672.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/sififijabomoporejolapoz.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/rixiwa.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/fujureguwudifu.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/nowol.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/rerav.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/91157487022.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///xipupetumezagekigidinelul.pdfIn PDF document text
    • http://4tyres.nl/public/files/41493562520.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/66981166233.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/jidapozemubemutoj.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/davc9lo86pm919jbdg1ii61b74/79092139407.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/64254337659.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/11367298645.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/26773034332.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/kifenitiz.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/puxolurafan.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/vufubilolibat.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/48420408434.pdfIn PDF document text
    • http://elitacasa.it/images/file/32665567493.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404067ec8a2---gofigozepizikixa.pdfIn PDF document text
    • https://fultoys.com/userfiles/71435562703.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_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 10084 bytes
SHA-256: 7865ace36e2a7f96f1b633c5eddf01ae4c078566c7ab9ec6f7995b78370958e5
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FD 18948 bytes
SHA-256: 85b15416f5d17dcdd3e52eeb7d298a7810f9503b4fabf1e5fa6f4a6f385d8e0c

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