Malicious PDF — malware analysis report

Static analysis result for SHA-256 2561a0c2db3a6e4e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 14:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86e69537624fd678021bc890cd48ed18 SHA-1: bcfaa7ba5114c3f88708963281f11c4b9a9ab2d7 SHA-256: 2561a0c2db3a6e4e476ebfb0b048ddcfcdb79da81ea3739a6b3ff2228ec8ba43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting a tactic to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://uhy-th.com/image/upload/files/soremamafuno.pdf In PDF document text
    • http://studiofapas.it/userfiles/files/18473720186.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/laxikojewereminonades.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/64105165493.pdfIn PDF document text
    • https://masukpt2.com/contents/files/10668270834.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9c6d9adc06e14c598aefdf510ad977b5/63922153344.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/ramixujuxoxira.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/buwupubugewagafonebulab.pdfIn PDF document text
    • https://europartner2.pl/uploads/geminiganiromokosi.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/totopawujigajoxipuxofelet.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/jefivik.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/76042472090.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/95266205393.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79e7a8999---56435012715.pdfIn PDF document text
    • http://chinalabware.net/d/files/kelojixebafo.pdfIn PDF document text
    • http://prompol.com/media/file/vulupikujariwug.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/puboze.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/20884175562.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/tegigukokov.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210902_082958.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210909142805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+transfer+contacts+from+ios+to+android+phonePDF 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_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 10916 bytes
SHA-256: 5eee569c0a2a7c67dac0df8baecd0e05fd54acf3f5f838448c8d249f6e0c3e0a
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 17804 bytes
SHA-256: 4cc536db8812617b174723a99904abee2363156d8596eddabcc9fa81d9f67bea
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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