Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1681d3b06501946…

MALICIOUS

PDF

100.6 KB Created: 2021-02-19 07:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b4c9cfab46545a0b43d2e43b7def9f26 SHA-1: 7f86564ed8426836154a260665353ba36bda2f0d SHA-256: f1681d3b06501946bb2b38a67de7a1b7bdc69cfc68ace2ada20e93e39511a7e0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/aws?utm_term=how+to+read+egypt PDF link annotation
    • http://ndfnasg.xyz/ap_biology_neuron_structure_pogil95ias.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/xgdihgg/jetibomameputumazivifi.pdfIn PDF document text
    • http://pesale.pro/full_form_of_cid_and_cbi2jvhe.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/gjgcicB/fitaduwibote.pdfIn PDF document text
    • http://m-ryanaf.site/realidades_2_capitulo_prueba_1b-_1_answers0r94n.pdfIn PDF document text
    • http://retys.fun/31315264099vq60e.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jiWhcpV/15446798383.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/gcNkTgj/sevanagafinoratuvuvev.pdfIn PDF document text
    • https://cdn.sqhk.co/sudizatase/B6tmggc/pevulel.pdfIn PDF document text
    • http://keepmaxi.space/quotes_from_jocko_willinkp3wao.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/jhMjjgj/48679199632.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/jbR0hgH/strikers_1945_world_war_guide.pdfIn PDF document text
    • http://tcerkovniekupola.space/virginidad_2.0_recuperar_la_inocencias08k1.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/834909793er0uj.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/hhRMFjh/judadatapuvodupas.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/fhbia4H/turelile.pdfIn PDF document text
    • http://generatorsale.ru/jabanepojatifixugog4wl93.pdfIn PDF document text
    • https://cdn.sqhk.co/refevebux/moRibCs/design_island_3d_home_makeover.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/fidobakipivogit/newwave_tv_guide_kennett_mo.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/oxford_practice_grammar_basic_diagnostic_test.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/consumer_reports_tire_gauge_ratings.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/boiiisam_9-_5.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_off00014ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA7 5072 bytes
SHA-256: fb5ba7889625fb98782a07f67888b8f717e98951689ddbf4be66cf2b6425e61e
font_01_sfnt_off00015d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0D 11712 bytes
SHA-256: 1fcfed99fd782c9801d51c27ae6a1ee8bdc9ead55f91e85ebccd1720a4b13bff

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