Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba738fbb61de392…

MALICIOUS

PDF

72.1 KB Created: 2021-02-04 10:15:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b3e149b920b2ab14892dd1f085533c9f SHA-1: 20ab5924beac361eac267224432b753ff4f07795 SHA-256: fba738fbb61de392e03d892bf05f17fc6b4820a8700f06f04625e964284b5eae
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm designed to drive traffic to various websites, potentially for SEO manipulation or phishing. The document body, though heavily obfuscated, appears to reference a 'gerund worksheet for grade 8', which is likely a lure to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/aws?utm_term=gerund+worksheet+for+grade+8 PDF link annotation
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/edbf7.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/xutifodelavu_zawamigu_kilom.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/javaxanemel-pumuve-pepit-zojogines.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/manevilisuzigi.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/8636765.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/2472096.pdfIn PDF document text
    • http://mrt-zdes.ru/diagrama_de_flujo_simbolos_ansikzuq1.pdfIn PDF document text
    • http://businessoutsourcing.org/the_yawning_portal33rjk.pdfIn PDF document text
    • http://jebuzakawug.iblogger.org/housing_allowance_application_form_for_tenants.pdfIn PDF document text
    • http://pusokum.66ghz.com/winrar_mien_phi.pdfIn PDF document text
    • https://pudibapajupi.weebly.com/uploads/1/3/3/9/133986481/pimepofowexuzuj.pdfIn PDF document text
    • http://petersikdar.com/drastic_emulator_full_apk6upri.pdfIn PDF document text
    • http://znakomstva18x.site/povozezulbawf.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/tizowodifi/statutory_declaration_form_victoria_authorised_witness.pdfIn PDF document text
    • http://rujipezoj.epizy.com/55878706582.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/delete_search_history_on_google_maps_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/bombay_velvet_movie_123mkv.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/15782810513.pdfIn PDF document text
    • http://xibubew.epizy.com/lm339_smd_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/septic_abortion_management.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 5520 bytes
SHA-256: 8e21cfc6b600aea01242aebf1d9c227f74e800376821da3ac2c844ec4c893bba
font_01_sfnt_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 10344 bytes
SHA-256: e78c5dcdaed1fdd751b30b845bea3ff04c95a3def28b0b38ed4bc5e1a1a07d78

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