Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f835e153bf01521…

MALICIOUS

PDF

68.2 KB Created: 2021-04-12 01:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae074afcc067a23011801bb221fcca46 SHA-1: 12a5e8b846e1b6e372aa1dec59ac1fa6d836e2a2 SHA-256: 1f835e153bf01521cf6a231ecd5d73144acff5c0f49830a9737c6b62f457ceb0
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://mezovuduw.ru/strik?utm_term=organic+chemistry+1+acs+review PDF link annotation
    • http://nemugub.mywebcommunity.org/watermark_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/jgjb70g/free_to_air_tv_guide_townsville_tonight.pdfIn PDF document text
    • http://birixuxewazotaz.mywebcommunity.org/9533520280.pdfIn PDF document text
    • http://xukenevu.22web.org/accounting_for_beginners_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_600ae94ecd2d7.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/the_metallurgy_of_anodizing_aluminum.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/igcaZje/39859390429.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/bellman_ford_algorithm_example.pdfIn PDF document text
    • https://cdn.sqhk.co/wizevomorofe/jcgeIhi/ice_cream_delivery_near_me_cash_only.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/ajccghu/easy_and_simple_pound_cake_recipe.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/sales_and_marketing_training.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/63786673260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bawavejukedosuv.epizy.com/musubejurap.pdfIn PDF document text
    • http://zomusuxine.rf.gd/jopulesarunugu.pdfIn PDF document text
    • http://lofuwokapowudug.rf.gd/70888006081.pdfIn PDF document text
    • http://vuxikujare.epizy.com/33467478599.pdfIn PDF document text
    • http://jonemif.epizy.com/tuning_ukulele_senar_4_apk.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_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 5512 bytes
SHA-256: 2f59946ff6d79b354ef757a4f65d4aff3cd23ed1217a1897d470d1eb8f6c53d7
font_01_sfnt_off0000e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 10396 bytes
SHA-256: df4ba29b27d3614304db5a053ab5333204e32d6ca54916299c6f12ce7e5448a8

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