Malicious PDF — malware analysis report

Static analysis result for SHA-256 9685311d8fb62b79…

MALICIOUS

PDF

78.7 KB Created: 2021-03-11 22:59:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 177745cb2d5ea73aacb0572a2b2f0583 SHA-1: 84503f889de4222f8507250a2ec9860b21d030b0 SHA-256: 9685311d8fb62b7916225e0949cf8b03200318fd4bc4ab3efa82dfff98871cfc
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/123?utm_term=aharoni+font++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380395/normal_601d2d25e6da4.pdfIn PDF document text
    • https://lugifepitel.weebly.com/uploads/1/3/2/7/132710690/fitonuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_600de3d9ab2bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5fe055d2105bb.pdfIn PDF document text
    • https://cdn.sqhk.co/vepanoxubere/6igG9gi/month_calendar_template_september_2019.pdfIn PDF document text
    • https://lajejajutabi.weebly.com/uploads/1/3/6/0/136050508/lorawotefagozew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460060/normal_5fe59670d6218.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/bigChjf/garegowadid.pdfIn PDF document text
    • https://weranatowo.weebly.com/uploads/1/3/1/4/131408071/951013.pdfIn PDF document text
    • http://doxugivo.22web.org/genitive_case_english.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/gjrHFv5/dadutu.pdfIn PDF document text
    • https://resivoviwogo.weebly.com/uploads/1/3/3/9/133987135/bd58ad5bcb702f3.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/9649082.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/iayeege/70131752093.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/towajiwazititamozo.pdfIn PDF document text
    • http://edalovert.xyz/jemegesuusg1.pdfIn PDF document text
    • http://rkconstructionsucks.com/rusarewotizexubarajeso2xnnq.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/pukhf4j/12408804777.pdfIn PDF document text
    • http://richteam.site/guided_reading_level_a_booksbk3gx.pdfIn PDF document text
    • https://zaxonuwikujad.weebly.com/uploads/1/3/0/8/130874627/pexeludexona-tajuwavabamuja-tewofebemegali.pdfIn PDF document text
    • http://cucoupon.info/30660315782n8d1t.pdfIn PDF document text
    • https://wimofitadaxota.weebly.com/uploads/1/3/4/3/134362004/224123.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/nezava-mivogupu-podugager-bibaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tekunobujolid.epizy.com/buscar_mi_dispositivo_android_app.pdfIn PDF document text
    • http://jofiwevamixeta.epizy.com/kingdom_hearts_3_synthesis_trophy_guide.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_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 4636 bytes
SHA-256: 4f3dced9e1ac01c8f7a40929efd03231d955578c390ac785c91d35b5882500d1
font_01_sfnt_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 10600 bytes
SHA-256: bde88f1af0e9b73098d59ecee59a69f0e89ad8ad2b5e0151e4eab28fe0d2327a

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