Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f89f0934cb028d8…

MALICIOUS

PDF

78.5 KB Created: 2021-03-25 18:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1d44df2cd2032c9468f9fdaf2e3b3aa4 SHA-1: 3f1dbe574045a9050675cad31765987e8f923bac SHA-256: 8f89f0934cb028d8dd5859939594e072ef444f42e79903d542911b99e2f9d830
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 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 0.9994

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://midufefew.ru/strik?utm_term=yo+yo+ma+famous+quotes PDF link annotation
    • http://itclick.pro/lazopefesifo8zzz6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383327/normal_5fe2b2d2066d8.pdfIn PDF document text
    • http://armada.technology/balanced_scorecard_performance_appraisal_form15daq.pdfIn PDF document text
    • http://zerkalo-fugicar.website/nadixulogi0dz1j.pdfIn PDF document text
    • https://venepefo.weebly.com/uploads/1/3/4/6/134666716/6266726.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/7bd1ac5c36.pdfIn PDF document text
    • http://vinnipoh.fun/segiwosebuvimisogisuxrssfn.pdfIn PDF document text
    • http://3bki.ru/lofosaxiwadtm7dt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_601dbc1585d33.pdfIn PDF document text
    • http://eurosett.net/how_to_setup_a_canon_wireless_printer_pixma_ts3122tkwhd.pdfIn PDF document text
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/jimipiwuxesu-zotegunun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_6046b1b39f757.pdfIn PDF document text
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/wifamojo.pdfIn PDF document text
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/5444864.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/wegemebufojafak/59088700132.pdfIn PDF document text
    • http://puzenufamem.rf.gd/43386119519.pdfIn PDF document text
    • http://diwiludoki.rf.gd/ammonium_hydroxide_physical_form.pdfIn PDF document text
    • http://mosiwifu.epizy.com/dafuwudetajokijufililanaz.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/luvitogeretedus.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/synthetic_antimicrobial_agents.pdfIn PDF document text
    • http://jumebesatupa.epizy.com/zubivixinesogalibekato.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/11572262791.pdfIn PDF document text
    • http://kagilabitivibe.epizy.com/dating_scan_accuracy_7_weeks.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_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 4976 bytes
SHA-256: f0ef261d4a35df072d7702d4c91970dc7c25fb9c2b69db2d0e07ec8323509998
font_01_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 10864 bytes
SHA-256: 844dad8320904159035381a30aa75b34985eb26bff0caddaa98c73a11340a13e

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