Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5f26dc94eab950…

MALICIOUS

PDF

106.4 KB Created: 2021-01-18 21:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9362610881737227e4b89ecf4e49a0c8 SHA-1: 56b40a1e7476ff2f32f73b07de456fc66a6906dd SHA-256: af5f26dc94eab95092974e8496fb3f9a6025c5b8e53c5ad48029e957d276aef2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, with a specific URL pointing to 'baarspo.ru' which is likely malicious. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly suggest an intent to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/123?utm_term=csipsimple+apk+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496380/normal_5fda274ce3c34.pdfIn PDF document text
    • https://fenejetamop.weebly.com/uploads/1/3/4/6/134697978/kitasebofadizam_xosorad_sawolow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5fb2b5e9bbb2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_5f9cd1a05293e.pdfIn PDF document text
    • https://kafazuvowimi.weebly.com/uploads/1/3/4/7/134705673/6344116.pdfIn PDF document text
    • http://boxidodo.22web.org/15418528326.pdfIn PDF document text
    • https://kuruxodevudule.weebly.com/uploads/1/3/4/7/134728431/5866635.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/bobov_subuf_bamapawunuj.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/kipexutelunusevogegigupom.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/39690796919.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/seduna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5fb9296b3fbef.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/lorifawuvawot/748951851.pdfIn PDF document text
    • http://gusalixofunek.epizy.com/adjectives_worksheets_kindergarten.pdfIn PDF document text
    • http://sajipesexadagon.epizy.com/field_trip_report_write_up.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/pesuvewe.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/50330204760.pdfIn PDF document text
    • http://luwefotikejumu.rf.gd/niraxasenuxiviz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 27404 bytes
SHA-256: 018a1c9bb1a3bcbcb876bd1812c3fce26e906675bf760a09dc47a36ee064b36f
font_01_sfnt_off00014bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB0 5356 bytes
SHA-256: 443c42080dde2ca6fed608d3e05467302ad528eff42ceb14577f25f2c9a9af3c
font_02_sfnt_off00015dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD5 12224 bytes
SHA-256: eefb49cd5fcb9725aabf7408d7d811cde42188b2a55f4d9ca3a4b0a1c1fc596c
font_03_sfnt_off00018691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18691 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443

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