Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadb2f00be9d253b…

MALICIOUS

PDF

92.2 KB Created: 2021-03-28 17:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 83b1bdf290adf724f923eb6315c50ef7 SHA-1: ef70b3bbf02c006a80d677bcd91a1c029de486c6 SHA-256: cadb2f00be9d253b2625125857302ff9fa57db97359eac03e086d72140d4827f
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://nipisod.ru/123?utm_term=anemia+de+celulas+falciformes+pdf+2017 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495395/normal_6038274f94bd3.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/gghgVsR/christmas_events_in_my_area_today.pdfIn PDF document text
    • http://wugafis.66ghz.com/38821979273.pdfIn PDF document text
    • http://vashobereg.com/movie_review_samples_for_studentse22ik.pdfIn PDF document text
    • http://grantmedica.ru/96568808195x0div.pdfIn PDF document text
    • http://teaitalis.space/33605971505sf2u7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444378/normal_6048368015fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_6038e4f5434b7.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/ifgih3a/wenitovifogi.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/ZSihRD7/beyonce_formation_tour_netflix.pdfIn PDF document text
    • http://idealslim-ordina.site/d_day_movie_2019_streamingieveu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_6033a0aa43ce6.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/nuxomigo/bivafox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c7f2c9f-6337-4ded-bfbf-574af9d4feee/44316934402.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/kansai_electric_power_co_inc_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c57c5d4-062e-4d88-8310-a0b9d05a9760/nyc_tlc_exam.pdfIn PDF document text
    • http://vadibezodaxilez.rf.gd/padeg.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
    • https://doi.org/10.29375/01237047.2378In 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_off000126c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 5696 bytes
SHA-256: 36f55986a5983c51ccb1d8cbce91d8d9d5f0106e881d093065713131d9305c72
font_01_sfnt_off00013a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1A 12308 bytes
SHA-256: 4adc47e78e66ff10a884f454df14052097699566d662a03a2e24748e7ac4887e

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