Malicious PDF — malware analysis report

Static analysis result for SHA-256 16900e62b66def4d…

MALICIOUS

PDF

76.0 KB Created: 2021-03-19 20:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dde81c81f20a452627ae455d2bafedbe SHA-1: 9d462194298451d0f4d4f260756ade75defc4025 SHA-256: 16900e62b66def4d7742f7669bc7bb07b0d062b827df1045d16f7ed0fd9663f5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=google+maps+street+view+mobile+iphone PDF link annotation
    • https://modulofironufi.weebly.com/uploads/1/3/4/4/134402713/e621fca9da1aa58.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/38025112998.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/reglementation_bancaire_cemac92xuz.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/dyson_dc41_replacement_parts.pdfIn PDF document text
    • http://znasila.ru/64154167996jcnct.pdfIn PDF document text
    • https://jaxefosizi.weebly.com/uploads/1/3/6/0/136083017/tiweriv.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/d270a6aa4ad.pdfIn PDF document text
    • https://wesoxuzepa.weebly.com/uploads/1/3/4/3/134372623/9384428.pdfIn PDF document text
    • http://wajofima.mywebcommunity.org/govilidedesirolavona.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/how_to_study_for_drivers_ed6txxu.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/44417966593.pdfIn PDF document text
    • https://lirukasuk.weebly.com/uploads/1/3/0/7/130739032/puvutavoviliziwomo.pdfIn PDF document text
    • https://dabesego.weebly.com/uploads/1/3/2/7/132740865/e7a78b57ba337b6.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/tonemakopinibem/akcent_video_songs_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/cadbury_sixth_form_college_ofsted.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/40508761326.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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 5556 bytes
SHA-256: 44998f9820a6286bb62d51de0ab4162b0047d211318bbe048b2dd89fdfc23d6a
font_01_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 10632 bytes
SHA-256: d30320b2ba18a42ed9e1b9f81e67f73ba0eee3fc2e89b7cd0f17d4e8d2b0a783

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