Malicious PDF — malware analysis report

Static analysis result for SHA-256 83492b57e8684e7f…

MALICIOUS

PDF

72.7 KB Created: 2021-03-20 12:27:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 98c1a509a5701fb72e8392363358fa5b SHA-1: 560a1c17b42fdcec5aabde4a9b27af45f9e5936b SHA-256: 83492b57e8684e7fd15cd27e95fbcd18c457b0cdfb7492653b5410f31f27ae1c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 5

  • 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://midufefew.ru/123?utm_term=lange+case+files+pediatrics+pdf PDF link annotation
    • https://mewotevavaxaviz.weebly.com/uploads/1/3/1/0/131070751/balufegud-kojigexulazaduz-zifufojir-fobabekumulatos.pdfIn PDF document text
    • https://dadurafiwazozu.weebly.com/uploads/1/3/4/7/134768329/6513326.pdfIn PDF document text
    • http://fabulouss.space/grado_de_hiperestaticidadnl5dt.pdfIn PDF document text
    • http://insurancesouk.com/708843418432nc0q.pdfIn PDF document text
    • https://desujerobum.weebly.com/uploads/1/3/1/0/131070458/bakevawaxonofixe.pdfIn PDF document text
    • http://teplotronic.ru/14895624313qv59u.pdfIn PDF document text
    • https://gizizajavime.weebly.com/uploads/1/3/2/6/132695742/mesivid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417403/normal_60301fbeeae68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_604fef605fe67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_6043c03927c29.pdfIn PDF document text
    • http://dress-russia.ru/miele_vacuum_cleaner_dealer_near_melv0pu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_a7dff9d8d4004edcbf9872b9e7ab8d67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/67367402967.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_473cb64ed7ff499489cc4a03a16b8e45.pdf?index=trueIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_f235f98f9a6e423eac8f3235f1e06fb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/danijixivexa.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/79040939573.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/lancetas_accu_check_guide.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_82b8520085444ed3b7054873aa80ae8f.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_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 5264 bytes
SHA-256: f7636c5b51cddd21bbafb1a25b2c4478f7c61ccaf37aff876c0f12c8f5e36af1
font_01_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 10532 bytes
SHA-256: 8b11349603aac80b00b38028fc1c695ae0f5f96c7cfe773daeec5f8ae1f01683

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