Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b76f5e2b19b39a6…

MALICIOUS

PDF

90.8 KB Created: 2021-04-05 22:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5e1a5407c8c907ca732cdb999427e355 SHA-1: bc0ac5f74deee6da1121e35137072e2fefcaf514 SHA-256: 1b76f5e2b19b39a62c5514c97efa00a2c655615efd6c00668047f6e0e1c548e0
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+is+an+integrated+headset+mtb In PDF document text
    • https://cdn.sqhk.co/siwowoso/ZigN8sL/79259406561.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/c8AWSjc/94695154935.pdfIn PDF document text
    • https://fogebutozedelig.weebly.com/uploads/1/3/0/7/130776223/midej.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwuvume/e5Cjhhb/altice_usa_contact_information.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/wisatoxanuloveru.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/jhj8hhR/cheap_cruises_from_florida_june_2019.pdfIn PDF document text
    • http://donuliwobem.iblogger.org/git_install_windows_10_guide.pdfIn PDF document text
    • http://jonapesi.22web.org/bssc._bih._nic._in_admit_card_2020.pdfIn PDF document text
    • http://viterosogem.iblogger.org/syllogism_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/jbgejdZ/keep_my_notes_backup.pdfIn PDF document text
    • http://wavolat.iblogger.org/portable_travel_washing_soap_sheets.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/blank_risk_assessment_form.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/feb944023dc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuzudaru.epizy.com/pdf_to_word_free_from_nitro.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/bejawada_naa_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/97398987832.pdfIn PDF document text
    • http://jukiwifid.rf.gd/lord_krishna_quotes_bhagavad_gita_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/korg_volca_sampler.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/who_delivers_dunkin_donuts_near_me.pdfIn PDF document text
    • http://kuvevepakamobo.epizy.com/anglo_american_literature_grade_9_module.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_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 5360 bytes
SHA-256: a0d0bc5e5af55226c660cb004db291d07f3db6ac243c7cb559f4da1200d4c16e
font_01_sfnt_off0001396c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396C 10576 bytes
SHA-256: 6094ccca04918ed955553967a8cd75d26c1fb9294a0c2d5687dbc805497228d6

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