Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5abe711a455fda…

MALICIOUS

PDF

83.2 KB Created: 2021-03-21 05:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 89eada840c08a953498ae5b22d5055b8 SHA-1: 960b4f88c0d801b62dc531ae184fc890281ce00a SHA-256: 7b5abe711a455fdace99c8ee450c9300d1f36ffadf289b38e2df87c50def376d
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://midufefew.ru/strik?utm_term=hp+pavilion+15cs3073cl+review PDF link annotation
    • https://cdn.sqhk.co/sijiposago/i6haDE0/tixudedu.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/ughajff/dofobenoxavevovunivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5fe6c849f1ad9.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/5937783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_604d1ae15454b.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jihjg3n/gcc_bookstore_az.pdfIn PDF document text
    • https://zavadogo.weebly.com/uploads/1/3/4/3/134325895/kavokubigozob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_600c1ba9144e2.pdfIn PDF document text
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/berixa.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/capital_cities_of_the_world.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/jjunkif/fatokinojusininuposimobiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medexode.atwebpages.com/sistema_endocrino_para_nios_de_6_grado.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/begolavitelivatomepojido.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/fifagizogu.pdfIn PDF document text
    • http://zaxatuparogojix.epizy.com/horror_stories_in_telugu_free_download.pdfIn PDF document text
    • http://dimazobuxijema.epizy.com/57045531401.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/developed_vs_developing_countries_worksheet.pdfIn PDF document text
    • http://genenapukiral.epizy.com/4043127358.pdfIn PDF document text
    • http://zubumedi.rf.gd/automobile_spare_parts_shop_project_report.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_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 5600 bytes
SHA-256: 94d5873e37dcc4f8744c064dbee5aa73b8807d58324ff1745621af97846ec2a2
font_01_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 11232 bytes
SHA-256: aadb63eb4aa6d250454b9c57136f3c685bee8f3e4e2cdd818269344778bd4ee9

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