Malicious PDF — malware analysis report

Static analysis result for SHA-256 2736d6afa5c16c43…

MALICIOUS

PDF

75.4 KB Created: 2021-03-14 11:20:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8edacb84510ef0dca8ed7de38273f301 SHA-1: a9e72380d3c485aa80439d0fddaefa32c430acb8 SHA-256: 2736d6afa5c16c438412aac234e86f36cdbc36f6c47ea5f6dd8ac1d1d3eb3bd2
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 0.9996

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://dafemum.ru/123?utm_term=formule+pour+calculer+l%2527+age+dans+excel PDF link annotation
    • https://vavivaso.weebly.com/uploads/1/3/0/8/130873957/134730.pdfIn PDF document text
    • https://mowasevibipogo.weebly.com/uploads/1/3/1/3/131379904/2f4d50eba3874.pdfIn PDF document text
    • http://pycnidwzxc.info/who_started_cognitive_psychologytie3j.pdfIn PDF document text
    • http://homearfes.com/88224285316kfuco.pdfIn PDF document text
    • http://igcopyrightforhelps.com/anlage_v_2017qmkwx.pdfIn PDF document text
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/e3e2f9ac421045.pdfIn PDF document text
    • https://gojufoviwovefu.weebly.com/uploads/1/3/4/5/134515133/tefiwode_zijojaxivif_punelata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408462/normal_6033f4dc22267.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/xokobefajifizam.pdfIn PDF document text
    • http://larebalin.mypressonline.com/mipufizobumutupesuj.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/8e3979c394b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_601f3eabcf478.pdfIn PDF document text
    • http://winoorama.site/wireless-n_ap_repeater_router_setupbndy3.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/rujizozi.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/71712224386.pdfIn PDF document text
    • http://com-copyrighit.com/rutobesrmjob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_78cea87f40ab425bb71ff35ff86dbcbc.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_d66b0bc9aaf0479798fd0f155cbf86a6.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_87671777ec0a4491b522207b325bda31.pdf?index=trueIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_823ddb9a9bf54d8a925297a014d2b779.pdf?index=trueIn PDF document text
    • http://misanedajog.myartsonline.com/is_the_uppababy_stroller_worth_the_money.pdfIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_fa1a097052eb43e4b713f942d4f81dfc.pdf?index=trueIn 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_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 5448 bytes
SHA-256: afac74e095d17c5a50d28d2c690fa2ec919e70b5fa440fe4c664dbea33cbe60b
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 12136 bytes
SHA-256: 2d75bdc9a09ea64e2fa9fc758a8f2a16cd7f993b76b243497855fd3500f669a2