Malicious PDF — malware analysis report

Static analysis result for SHA-256 5209edec75fe0c63…

MALICIOUS

PDF

68.1 KB Created: 2021-04-06 17:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a8120c44061044296dbbc7443ca24eb7 SHA-1: 5b251ea02b023c65d6194ee2d33a423d9ee22088 SHA-256: 5209edec75fe0c63998a7fac4c5293ff0551a17e5ff444110327c341dde2bd4d
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 0.9997

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://gimoguvi.ru/award?keyword=cambridge+english+second+edition+advanced+trainer+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481841/normal_5fd99fafaa229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464870/normal_603a7e74399c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465123/normal_5fcf77c4e18f5.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/spektrum_dx4c_compatible_receiversk4q6j.pdfIn PDF document text
    • http://esagafow.fun/farewell_to_manzanar_audiobook_chapter_3iwco3.pdfIn PDF document text
    • http://preplafond.xyz/bacaan_al_quran_dan_terjemahan_indonesiad0qqg.pdfIn PDF document text
    • http://handler-autoscout24.com/606815815111qudg.pdfIn PDF document text
    • http://insuranceautousa.com/britax_marathon_car_seat_installation_forward_facinge1y42.pdfIn PDF document text
    • http://dithetsen.xyz/viladogefilipumutwf8.pdfIn PDF document text
    • http://vukipika.iblogger.org/nodedegi.pdfIn PDF document text
    • http://netabemoli.22web.org/pemofunudoguporidawapejup.pdfIn PDF document text
    • http://comp-arenda.site/newemi8od5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451376/normal_605f523df06ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_6014ca654356f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juguxawe.rf.gd/95035179966.pdfIn PDF document text
    • http://zudozam.epizy.com/cam_woodfield_infant_school_ofsted_report.pdfIn PDF document text
    • http://pogitijerilux.epizy.com/xijapozawu.pdfIn PDF document text
    • http://vorofij.epizy.com/26899845129.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_2c25cfe903e9445f96c274a0f7e42fd5.pdf?index=trueIn PDF document text
    • http://xikimafelote.epizy.com/webojonovi.pdfIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_e3aeabf81be54025aedbadef917f7ccf.pdf?index=trueIn 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_off0000ce48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 5676 bytes
SHA-256: ed9e10b92200c554c568a2eccaaa7f585756293207c7ce38ff6fb8b9051be7a9
font_01_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 9760 bytes
SHA-256: 58c85e4cd0ddd7f479af82f78a5c8ea8d79b9bb5ffbb3020a632790ade50cb72

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