Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfb66e7f5d28d0d…

MALICIOUS

PDF

74.7 KB Created: 2021-02-28 08:25:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7713768f6f1a3131b21a7a93873aab4b SHA-1: fba239f3d4cfc6ef71f71745eadf400811f6c337 SHA-256: 8cfb66e7f5d28d0d9cfc833df227e1efc681b43196aac176a55425bc5615d827
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, a common tactic for link farms used to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, such as 'http://giocodigital.fun/indefinite_pronouns_exercises_with_answersml30d.pdf', are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/award?keyword=dunkin+donuts+coupons+code PDF link annotation
    • http://giocodigital.fun/indefinite_pronouns_exercises_with_answersml30d.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/turexadovox_jededaded.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/uiiQpJm/energy_blast_anime_gif.pdfIn PDF document text
    • http://myyshooop224.site/asmaul_husna_adalah_nama_nama_allah_swt_yang_terbaik_atau_terindahk4zmh.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/2jihebp/58344480234.pdfIn PDF document text
    • http://mon-cmso.best/32142475552d1gl6.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/dihidVv/the_art_of_war_sun_tzu_documentary.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/gidolamopazuf-ranexa-jopozufivoka-xojasikil.pdfIn PDF document text
    • https://cdn.sqhk.co/ruselaguzoda/iMM5giW/gepepavale.pdfIn PDF document text
    • http://naturfresh.fun/computer_launcher_pro_apk7pkwm.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/jEhcjaJ/musynx_switch_dlc.pdfIn PDF document text
    • http://stnold.com/ms_word_show_hide_paragraph_marks0es3b.pdfIn PDF document text
    • http://doweryklkq.space/alkane_nomenclature_worksheet_with_answersa54l9.pdfIn PDF document text
    • https://puzerufatuv.weebly.com/uploads/1/3/1/1/131163838/tegipakojadapuvedan.pdfIn PDF document text
    • http://chelobaka.space/233017671487p63h.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/3jaIx5e/minecraft_java_edition_download_code.pdfIn PDF document text
    • https://cdn.sqhk.co/xekawiba/iXhjNus/pupilpath_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/eGPicjd/jipekekopemifofejuvuduxop.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/ayJMhi5/16080353085.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/NIgfifa/65939610682.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/gehhidq/zigojodu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 4792 bytes
SHA-256: 026c51591103c7ec4d1dfc5144a8b48da26a1acce8ac0d330863fd4d0a8a9ca4
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 10292 bytes
SHA-256: 00d0595358d939ee7ff2c86bd90a1ea2110220c2221d50dfd03da197ccfc41ff