Malicious PDF — malware analysis report

Static analysis result for SHA-256 036379c16a8a10e4…

MALICIOUS

PDF

118.2 KB Created: 2021-04-28 07:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d44785467337df36317c1d3635319fb1 SHA-1: 57c3f4e883d69be9a029704abde2fd62746d103f SHA-256: 036379c16a8a10e4dacefef613cfdbb7c4b4c619475805e5a5b66979f8355aff
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 0.9998

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://pelibifir.ru/strik?utm_term=human+trafficking+2005+movie+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378404/normal_60485330407f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_600a62bd0034a.pdfIn PDF document text
    • http://mubositesene.mypressonline.com/complete_guide_to_asperger_s_syndrome.pdfIn PDF document text
    • http://firstflirts.site/fervent_by_priscilla_shirer_study_guide3fe3n.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/38149857564.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/biraw.pdfIn PDF document text
    • http://pobunav.sportsontheweb.net/definition_of_motivation_file.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_605026c54067f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_5fdba89f1c94a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365606/normal_5ffbd14b97ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497081/normal_605161b3d733d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_601e4ac08af5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_602e785b4eb18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_600395934529e.pdfIn PDF document text
    • http://shothard.site/missguided_black_plunge_midi_dressfk2ai.pdfIn PDF document text
    • http://roserubusigiwij.mywebcommunity.org/nipiwuzoletifozaneraj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_6057efbd37d41.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/36317464927.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kogotiru.myartsonline.com/17079270350.pdfIn PDF document text
    • http://padusij.onlinewebshop.net/30374705790.pdfIn PDF document text
    • http://xowilewegiwo.myartsonline.com/free_multiplication_worksheets_grade_3.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_off00019413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19413 5752 bytes
SHA-256: e83a1ba2757f118179f5025972c162523dc38c3f4f9ea0f694c75575d2502591
font_01_sfnt_off0001a7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7A8 10552 bytes
SHA-256: b5519c321317736decf7a2fb0271c4dcbe45c73ae1c6a9109ffb89a54cb61528

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