Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be54ab0d31e3efe…

MALICIOUS

PDF

96.3 KB Created: 2021-04-15 17:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4963f5d11b597e2b1521964b3bfe9db5 SHA-1: 319d787093e6ced6b77e5c549ae1c2cd77f6a273 SHA-256: 9be54ab0d31e3efe0dac52ca79daebf4863a826f3e7d3803ce9c4e86887c9bb9
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=baldur%2527s+gate+2+jaheira+romance+walkthrough PDF link annotation
    • https://cdn.sqhk.co/mujexoxa/jfgekUP/nick_foles_celebrity_net_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/wogesowive/ijpJdEx/63293705425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_60127ef530038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_601ec1d2f1ca2.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/jW8ggqU/79873040648.pdfIn PDF document text
    • http://mozujana.22web.org/2004_honda_civic_oil_light_flashing.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/Yzgghbl/80992277576.pdfIn PDF document text
    • http://mestikon.online/86187898967v1egw.pdfIn PDF document text
    • http://degitowexara.iblogger.org/gajebipidebixug.pdfIn PDF document text
    • http://arm-watch3.club/job_interview_questions_and_answers_for_supervisorj2ump.pdfIn PDF document text
    • http://jipegogujozu.22web.org/learning_pencil_drawing.pdfIn PDF document text
    • http://help-ruleviolation.com/392679009283u0ia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_601973270a480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496811/normal_5ff91ad7efbfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rapabilalame.rf.gd/vodeputeduvuzini.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/la_noyee_yann_tiersen_sheet_music_accordion.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/hong_kong_guide_map.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/finance_spreadsheet_template_uk.pdfIn PDF document text
    • http://pewupetusazovow.rf.gd/71408928519.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_off0001378f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378F 5800 bytes
SHA-256: 2f9a0d365b7b9eaad69e9708be45039d2226e8b39efaa03125434a14da562bec
font_01_sfnt_off00014b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B47 11964 bytes
SHA-256: 9f26bf18ac35306f69f272418a859432eb3ae8cf3766b358dc3bf4b1039bf1dd

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