Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bc549d60054f5e…

MALICIOUS

PDF

81.1 KB Created: 2021-02-25 06:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 78e3fb05a7e5899dbd1bc252941b2df8 SHA-1: 5c9f585ea8389b74ca350e90d48456beb5dc80d2 SHA-256: f1bc549d60054f5ef26ff2f178487f720abade427c690bb4df5dc291341cd3cd
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness. The presence of embedded URLs and the structure suggest this PDF is designed to redirect users to potentially malicious or SEO-abusing websites, rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=should+i+take+a+cruise+in+2021 PDF link annotation
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/raninujolukiv.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/e8c0e03be.pdfIn PDF document text
    • http://morpeoplelife.ru/car_vin_number_free_reportzveca.pdfIn PDF document text
    • https://cdn.sqhk.co/wexifidobafo/6je3gdU/business_analyst_skills_in_demand.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/ehd3h3O/96264040710.pdfIn PDF document text
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/779ba5b28.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/will_star_wars_have_another_trilogy.pdfIn PDF document text
    • https://cdn.sqhk.co/zafowavo/aAjc1jd/redanenexuzifugiwogisad.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/wimapodumixesikapizokinek.pdfIn PDF document text
    • http://devlp.club/pdf_tablet_reader_free_downloadzpjy3.pdfIn PDF document text
    • http://sallehq.xyz/azar_apk_mod_revdlhuajy.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/q5geQ1n/36477107298.pdfIn PDF document text
    • http://gnatural.space/warm_bodies_2013_full_movie_in_hindiqraip.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/jeHydgd/12436380230.pdfIn PDF document text
    • https://cdn.sqhk.co/gimenuxot/hwnml54/wijozolixudujij.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/fmlhiha/pro_football_coaches_fired_today.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/begekewe.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/manual_de_organizacin_y_funciones_de_una_empresa_pequea.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/THDgdhh/zuxepofigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwedilejom.myartsonline.com/mumazowekulox.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_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 5520 bytes
SHA-256: ed5e25bf30b97d977e0d706f890922fb31711feef0b0a781f0120cb979789f34
font_01_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 11344 bytes
SHA-256: d635faf113029caa2ecf27e60fd6246113eafc90be581b656cd12f700446ce01

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