Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b5ea5a05d46877…

MALICIOUS

PDF

72.6 KB Created: 2021-06-10 19:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64d538fa65bcbb00f5e1608374a87869 SHA-1: ceae50c96054370ae72262caddfa9fca42d3fb5d SHA-256: f8b5ea5a05d468772ef49fa9e8cf1010fdafad211c7acc6983653e3778c66470
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which, 'https://queure.ru/pbw?utm_term=watch+online+movie+below+her+mouth', is flagged as suspicious and likely leads to a malicious site. Heuristics indicate the PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/pbw?utm_term=watch+online+movie+below+her+mouth
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fc911af94410.pdf
    • https://static.s123-cdn-static.com/uploads/4388065/normal_5fe2f16e713a6.pdf
    • https://cdn-cms.f-static.net/uploads/4490141/normal_603e725b3b61e.pdf
    • https://cdn-cms.f-static.net/uploads/4462066/normal_6063f6ba73301.pdf
    • https://cdn-cms.f-static.net/uploads/4446165/normal_604ad911c0644.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1066c1c4-b862-4dbf-81db-d9003715dde6/how_to_write_a_scientific_study_proposal.pdf
    • http://jojekepodef.pbworks.com/w/file/fetch/144625338/77387439899.pdf
    • http://zewalar.pbworks.com/f/celex_cecyt_3_horarios.pdf
    • http://fudejob.pbworks.com/f/veneja.pdf
    • https://uploads.strikinglycdn.com/files/6706856f-0bef-4049-8a3a-d3b37b4d9bdb/razemap.pdf
    • http://tejipufiwuma.pbworks.com/w/file/fetch/145066968/wuwugodifadavopevomet.pdf
    • http://betifufato.pbworks.com/f/oxford_english_grammar_course_intermediate_free.pdf
    • http://lulimogosan.pbworks.com/w/file/fetch/144492444/rirumiduzuru.pdf
    • http://ronefete.pbworks.com/f/exercice_les_mots_dela_meme_famille_cm2.pdf
    • https://uploads.strikinglycdn.com/files/e07614ea-964f-4327-9bd9-f9433c814c35/96752540475.pdf
    • https://uploads.strikinglycdn.com/files/854eeed3-2707-40f6-a6b0-562056d84b23/statistics_freedman_free.pdf
    • http://negovijalulu.pbworks.com/f/how_does_scout_describe_mrs_dubose.pdf
    • http://malamojozag.pbworks.com/f/lesson_7.1_practice_c_geometry_answer_key.pdf
    • http://kavuruxu.pbworks.com/f/homelite_gas_weed_eater_manual.pdf
    • http://tiduxikuve.pbworks.com/w/file/fetch/144557565/99324743850.pdf
    • https://uploads.strikinglycdn.com/files/e8c8feb8-7b5b-418a-ad26-a01196bacf9d/what_does_fasting_blood_sugar_test_show.pdf
    • http://vimadutukad.pbworks.com/w/file/fetch/144475137/13534577192.pdf
    • http://wafijovodek.pbworks.com/f/graphing_calculator_apk.pdf
    • http://rupebaxo.pbworks.com/f/12127618681.pdf
    • http://xexufokug.pbworks.com/w/file/fetch/144871704/allophones_of_t_in_british_english.pdf
    • http://xosezoranad.pbworks.com/f/budidotijut.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6c.bin
a76a0c500e404256502f5966334c9202dcaaed3308cb0213437dbd5de32b3b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 5164 bytes
font_01_sfnt_off0000f0ee.bin
9b50b95f8bd2721ce5511f271dcdf3f3ec155487ab57b8e8959bda178b2899f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 10484 bytes

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