Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2342a5f6500b75…

MALICIOUS

PDF

77.2 KB Created: 2021-03-15 01:48:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ba8a59a157c62ba5a619a009e9f7cfb2 SHA-1: a132970e060e1a6cf19e695aef49045710e796f5 SHA-256: aa2342a5f6500b75929ad29b774c3e77675ed3fbf6be2563afe95fc9dcd079a3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to disposable domains, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=smart+board+projector+upside+down PDF link annotation
    • http://moymagazin.xyz/free_worksheets_on_adjectives_for_grade_1j9tw6.pdfIn PDF document text
    • http://all-casino.xyz/samsung_galaxy_s9_price_in_pakistan_second_handism3d.pdfIn PDF document text
    • http://indital.space/what_is_business_mathematicsfzo64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_600ff5e0ea309.pdfIn PDF document text
    • http://carbackseat.site/mera_gana_baja_de_song_mingkzzjt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426410/normal_5fe658c11d936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488101/normal_603c6cb531212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_603e67d37026c.pdfIn PDF document text
    • http://all-host.site/warm_tiles_easy_heat_manualjesdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458852/normal_6014449a29a14.pdfIn PDF document text
    • http://opros.xyz/densified_biomass_fuel_report9bi5y.pdfIn PDF document text
    • http://groshyk.site/girawupawps1.pdfIn PDF document text
    • http://maykistore.ru/i_wish_the_kid_laroi_lyrics_deutsch6h9rp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454046/normal_603329c53890a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_6026dbe020d4e.pdfIn PDF document text
    • http://info-pages.ru/99493819325qx76z.pdfIn PDF document text
    • http://afracheat1.xyz/motorola_xts5000_impres_battery_chargerqjjjp.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/vikukinumet/unanswered_synonym_thesaurus.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/samsung_un32eh5300_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/luzebivoropugebimu.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_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 5600 bytes
SHA-256: 94493f68dc263dfa4e0f586b3e5161b55840fddc12fb2fd5cb2f23770c55f7cb
font_01_sfnt_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 11020 bytes
SHA-256: e1139d587f2d957fd49159c3d38b04a8d8cdb4653894e12a3679ad0deb1575c6
font_02_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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