Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f7b25b776d9be1…

MALICIOUS

PDF

72.6 KB Created: 2021-04-09 05:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dcaf869cb0c70263260202f51f99a53f SHA-1: 73bbef6bf25d058fe3fc545f21ebbcab2d7bedb5 SHA-256: d6f7b25b776d9be112516a20fd9ebc8ae622001701739ea8f40bb02d0d8ea010
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or link-farming operation. The PDF structure and the presence of many external URIs strongly indicate an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://druttle.ru/strik?utm_term=plan+y+programas+de+estudio+2011+artes+secundaria PDF link annotation
    • http://leseweremizew.scienceontheweb.net/lsen_von_gleichungen_aufgaben.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/4028354142.pdfIn PDF document text
    • http://honbiz.pro/guided_reading_goal_questions_by_levelqxrsd.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/how_to_connect_rock_band_4_guitar_to_xbox_one.pdfIn PDF document text
    • http://b0xberry.online/tulezakulofibiuqj1q.pdfIn PDF document text
    • http://future-techno.ru/mind-boggling_one-minute_mysteries_and_brain_teasersg6v7k.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/electrophilic_addition_reaction_mechanism.pdfIn PDF document text
    • http://tryse.xyz/free_college_algebra_worksheetsdg3sj.pdfIn PDF document text
    • http://3bki.ru/fakujejobadn77k0.pdfIn PDF document text
    • http://fodamibokaf.66ghz.com/antivirus_avast_gratis_offline.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/bise_lahore_result_2020_1st_year.pdfIn PDF document text
    • http://you-bestshop.xyz/sugizolemo67gh.pdfIn PDF document text
    • http://fepemewavitik.66ghz.com/medical_dictionary_book_free.pdfIn PDF document text
    • http://lifeeuro.info/silent_knight_5208_user_manualzh461.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/dapakakowulizegebemi.pdfIn PDF document text
    • http://zitosuganenat.medianewsonline.com/fagopidokiganebumaref.pdfIn PDF document text
    • http://covid-19online.site/lurotufivivexuzinooz42k.pdfIn PDF document text
    • http://testersairf.xyz/70308650892pqmk6.pdfIn PDF document text
    • http://zavifuvalo.22web.org/54678899445.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/befarekogol/42315786527.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/mi_planta_de_naranja_lima_audiolibro_descargar_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/fixovuxelata.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/91678102233.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/buffer_overflow_attack_tutorial.pdfIn PDF document text
    • http://zopimejumujodeb.rf.gd/sewing_machine_needle_charts.pdfIn PDF document text
    • http://kajifota.epizy.com/lexatumegiwanexudare.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_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 5820 bytes
SHA-256: c5f62b7c84a1e572e6101dc8e0e59adbca7549a1a6176f822c8efadffabeebb5
font_01_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 10968 bytes
SHA-256: 5f627014f609d88fad0ed9659aa68e1daa2c6b31cc7553ae7f14d43bd13663a0

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