Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1688c2c7840540…

MALICIOUS

PDF

82.2 KB Created: 2021-04-23 04:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b0e74de025bd8e9572e9d6868dd01acc SHA-1: a7497b678cb933f11ae8fd086294459ff1163f23 SHA-256: ed1688c2c7840540186659d6ecdd482bac668f7df24134ccef0e6dcc1899b563
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://baarspo.ru/strik?utm_term=delonghi+dehumidifier+manual+dd50p PDF link annotation
    • https://tilakajunobeka.weebly.com/uploads/1/3/0/7/130739719/gofijatipimavixasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_5fd9c99f7dc8e.pdfIn PDF document text
    • https://wutekeli.weebly.com/uploads/1/3/1/3/131379380/ladigeguvimematavadi.pdfIn PDF document text
    • https://nosavarugogitov.weebly.com/uploads/1/3/4/4/134488680/d5fc7c0adae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_603b7997d349a.pdfIn PDF document text
    • https://laxepesijuniz.weebly.com/uploads/1/3/1/3/131383562/fixoxaboleko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_6024be6f95244.pdfIn PDF document text
    • https://zedaluridafam.weebly.com/uploads/1/3/4/4/134464222/1d850bca75663bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500446/normal_5fe1a40e7b762.pdfIn PDF document text
    • https://nojasiputijaze.weebly.com/uploads/1/3/4/8/134869787/43519158c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kajonamopesubom.rf.gd/how_many_calories_in_a_dunkin_refresher.pdfIn PDF document text
    • http://jobasovuworijun.rf.gd/sql_server_2014_trial_version_free.pdfIn PDF document text
    • http://baxudoxubalafe.epizy.com/45378374534.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/bavisanos.pdfIn PDF document text
    • http://zefitog.epizy.com/burmese_days_analysis.pdfIn PDF document text
    • http://rinejifivazori.epizy.com/embroidery_designs_dst_free.pdfIn PDF document text
    • http://nagasupewi.rf.gd/noxowiwupoxufovef.pdfIn PDF document text
    • http://kubudafexajik.rf.gd/vidmate_all_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/37764099234.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_off00010189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 5540 bytes
SHA-256: de773813100aa2615c5144239aa229a7d055e2e655b6d05313517993a3190298
font_01_sfnt_off0001143b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 11436 bytes
SHA-256: ede7e1e357d46eae794712a13a842ed94114f966f697ad1a1dd7b5e40d781026

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