Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c317628dd24684…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 19:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 03ffde65b2eee84678ea3706620a98b3 SHA-1: 056e96dd73cc4d4cfba6bd678acfb1d238414bdb SHA-256: 79c317628dd246842b0e55eb659dbdd9b185af91a847a042de92928f3cc0d278
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs, one of which is hosted on disposable infrastructure. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/award?keyword=economia+ambiental+pdf+libro PDF link annotation
    • http://tigafik.mygamesonline.org/delegation_of_authority_letter.pdfIn PDF document text
    • http://fajamad.mypressonline.com/global_history_regents_essay_examples.pdfIn PDF document text
    • http://radulukolataleb.iblogger.org/hornady_reloading_bench_stool.pdfIn PDF document text
    • http://foodguideblog.com/43839076440jumvb.pdfIn PDF document text
    • http://shopbest.online/7147460485422r73.pdfIn PDF document text
    • http://smartcreditus.info/55382159705sr6cl.pdfIn PDF document text
    • http://xigujawuruwuko.22web.org/discussion_questions_for_letter_from_birmingham_jail.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/sosula.pdfIn PDF document text
    • http://xivusolokedujes.22web.org/pelopavoduzowiligobas.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/ejemplos_de_monosacaridos.pdfIn PDF document text
    • http://mishabelle.ru/kolosafajonijige0cq5.pdfIn PDF document text
    • http://nexusisuperat.22web.org/twitch_affiliate_tax_information.pdfIn PDF document text
    • http://morpeoplelife.ru/download_novel_hunger_games_bahasa_indonesiawt6jx.pdfIn PDF document text
    • http://biomanix.best/all_rounder_audio_songs_com604x7.pdfIn PDF document text
    • http://olipaka.xyz/hp_photosmart_c3180_error_check_print_cartridgeo6jzz.pdfIn PDF document text
    • http://lotto-investclub.com/present_continuous_and_present_simple_exercises_for_beginners2zjrg.pdfIn PDF document text
    • http://tadakon.iblogger.org/24197117829.pdfIn PDF document text
    • http://bluebadge-support.com/toto_toilet_flapper_replacement_thu175smy1xo.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/what_is_links_age_in_breath_of_the_wild.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vezoxonu.epizy.com/47223291944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/983c1d25-82e5-4419-85f1-cb8e0c6d2c3a/cuales_son_los_mejores_libros_de_economia_y_finanzas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1729691d-3d97-4a4e-9ff4-384701e22e2c/4897091185.pdfIn PDF document text
    • http://losirerosusakaf.rf.gd/list_of_descriptive_adjectives.pdfIn PDF document text
    • http://gugujis.epizy.com/xuxefitosov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/142c1ea8-10aa-4457-b952-daf846f657a2/jee_mains_2016_merit_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 5008 bytes
SHA-256: dbc04cb32320532d0f4bf3560c96fa89bc02186aef7c1ff8757eebdabbb108ce
font_01_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 11956 bytes
SHA-256: 3b6b0d5055d670b5b90374f9974f771e1abe63e82d8192865988f24f2adf5bb0
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378