Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d373e7618063935…

MALICIOUS

PDF

83.3 KB Created: 2021-03-15 23:27:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d4612daef8972a4f1868783a86db4807 SHA-1: fc45fdd2fd524c9d4b420d5d3393f5b6e870af8c SHA-256: 1d373e761806393557223d9d97dcab59c8dd5eae8ae4d07d36e930dd575b2eaf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution vehicle. The document body, though heavily obfuscated, contains keywords related to downloading PDFs, suggesting a lure to a malicious site. The presence of external URIs and link farm heuristics further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/award?keyword=baixar+pdf+passei+direto+iphone PDF link annotation
    • http://bulakirip.getenjoyment.net/55945323844.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/the_whipping_boy_movie_trailer.pdfIn PDF document text
    • https://dogonurexuruvu.weebly.com/uploads/1/3/4/4/134475431/rajidofi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423443/normal_5fe49dc2ddb02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383147/normal_5ffdcacb9139c.pdfIn PDF document text
    • http://shimano-stradic.ru/801998326efp3i.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/vovedunobigisera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_60158275c83b3.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/garmin_nuvi_2595_lm_gps.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/78543853085.pdfIn PDF document text
    • http://curvepreloved.com/difference_between_tragedy_and_comedy6rwws.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/7845215.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/define_addition_of_vectors_in_physics.pdfIn PDF document text
    • https://rezemofojo.weebly.com/uploads/1/3/5/3/135321986/9b53acec4b86a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_603121caabde2.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/lulakewadefe.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/serogajugomiji/fobigogowuxadeka.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/duxunebetebetal.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/company_core_data_sheet_definition.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/database_security_tools.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/honeywell_hz-789_energysmart_oil_filled_radiator_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/tukimobijosononotezibofi.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/80655472969.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_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 5216 bytes
SHA-256: dae78df335cad7c478ee81ec477e16bfcfd60f9b99dec6a1b25bbaaf953ed350
font_01_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 13480 bytes
SHA-256: a1bab9d1baf92d382eff3e84bdce24ed64a3418186675691bf4cd9eedca19441
font_02_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210

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