Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e5191296d27044…

MALICIOUS

PDF

73.6 KB Created: 2021-02-09 17:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 075f00c9ec8b1a6d6bfa29eeb6f81a21 SHA-1: 9f4b3c25f2e43b31cdcd14151709615a677ce9a8 SHA-256: 54e5191296d27044c098941589551f055cbc3ea0e2e4f477b3a805505b4bd2f2
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 classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URIs and the overall detection profile strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wb?keyword=harken%20mainsheet%20car PDF link annotation
    • https://cdn.sqhk.co/karadirimose/hgrjfcX/free_offline_vegas_slots_casinos_chicken_dinner.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/Wih2pL0/wofuvakuvujonixanuneko.pdfIn PDF document text
    • http://clubstore.info/maximum_allowable_back_pressure_for_pilot_operated_relief_valvep7zjd.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/ijggLij/xotivoziwil.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/qGtwhbv/xipateritusajajajuk.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/EgeKYii/capital_account_and_balance_sheet_format_in_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/jfiihft/zebra_crossing_signal.pdfIn PDF document text
    • http://crawlmqyu.space/zitefukebotisunavefutx0xsy.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/f77Vide/68893166950.pdfIn PDF document text
    • https://cdn.sqhk.co/seranowe/Bcfhhh7/14395064132.pdfIn PDF document text
    • http://hydra.moscow/vericut_tutorialpitz2.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/gLiijf9/goddess_kiss_ove_coupon_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vojapulipono.epizy.com/goxizizewovaxusijibegaji.pdfIn PDF document text
    • http://tomabev.rf.gd/how_to_use_html5up_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/fiction_reading_comprehension_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/clerical_skills_code_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/laboratory_information_system_market_report.pdfIn PDF document text
    • http://vaxutusurinav.epizy.com/68879658233.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_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 5032 bytes
SHA-256: d96cf9d3da675fa4f15ecd9505f26e264b38d3b86a3be88d157f53c19a09725d
font_01_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 11396 bytes
SHA-256: 5d13511ad7838638290443104a4040fd9faac1795af91af0db03edc69a991552

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