Malicious PDF — malware analysis report

Static analysis result for SHA-256 e931e2b18184e802…

MALICIOUS

PDF

80.8 KB Created: 2021-02-14 21:24:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e62efb6fe0f21f7e2e04540f8e867d2c SHA-1: da91860b322f8fa27c5f153cea5cc9da4a7af6e6 SHA-256: e931e2b18184e80276edc94d4cc836b12d3f708cd27aff90e130c82d3c74bd65
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to 'Bella calamidades musica' and wkhtmltopdf, hinting at a possible lure or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=bella+calamidades+musica PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366348/normal_5ff342185972f.pdfIn PDF document text
    • https://mafinejolid.weebly.com/uploads/1/3/2/6/132683008/gavanufafuwid-makebejo.pdfIn PDF document text
    • http://libralab.digital/897086615235749n.pdfIn PDF document text
    • https://fomexiterejetax.weebly.com/uploads/1/3/4/4/134435806/gojugopuborul.pdfIn PDF document text
    • http://ellmax-site.xyz/sujeto_y_predicado_6_primaria3ddrx.pdfIn PDF document text
    • https://xakirajurupani.weebly.com/uploads/1/3/2/3/132303083/tevofojoguzog.pdfIn PDF document text
    • https://jiliwadikejupa.weebly.com/uploads/1/3/1/3/131379685/visezemotupez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timodetunidup.epizy.com/free_bootstrap_templates_for_admin_dashboard.pdfIn PDF document text
    • http://joretewad.epizy.com/27214695605.pdfIn PDF document text
    • http://gaxegumulot.rf.gd/bakery_story_apk_unlimited_gems.pdfIn PDF document text
    • http://zusatixolapurir.epizy.com/snackbar_android_example_stack_overflow.pdfIn PDF document text
    • http://poravilotizeve.epizy.com/wirifanadopugejil.pdfIn PDF document text
    • http://nerepigov.rf.gd/49991997439.pdfIn PDF document text
    • http://wirizobesopo.epizy.com/tifibivifinibisugirolapi.pdfIn PDF document text
    • http://xafonabikox.rf.gd/wow_alliance_leveling_guide_1-_110.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 5040 bytes
SHA-256: 90e23f3e136893a5704244110c5ec784f0e4d1d0188b6a523b065218e9a00a1d
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 11916 bytes
SHA-256: 2d8de7a964400a7a68f64b94e69d463eb78fca34f1e0b0375f3bd04d30602533
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 16148 bytes
SHA-256: 49aa8658fec835b433567452e339107b73bd4add7b6460494dbff709b0687583

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