Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef838c362d93c54…

MALICIOUS

PDF

66.4 KB Created: 2020-11-14 06:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ef271b872d3049582046a98378179dc1 SHA-1: ea456f5ec98927b1e548f0aabf4c107d39a09b4a SHA-256: 9ef838c362d93c54fc8b21aa405e1a55909a4e6cf0d080d18ba965d00e56ea85
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://trafftec.ru/aws?utm_term=excel+reference+sheet+by+index+number PDF link annotation
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/8056159.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/zumajevufopiwoxix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f980956a27e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f98330d2ae41.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/6675131.pdfIn PDF document text
    • https://wuserugojikenek.weebly.com/uploads/1/3/4/5/134513610/lemugajazujanelebumu.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/709b354e7bdbc.pdfIn PDF document text
    • https://danenogamapan.weebly.com/uploads/1/3/4/4/134481258/tabelavisumiwelegaba.pdfIn PDF document text
    • https://rodawuliwunugen.weebly.com/uploads/1/3/4/4/134490897/9412908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5faf4035b1118.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/22056554-f3c3-442d-911a-e1bd24ca8ddd/pobibizitofisebuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0cc772a-8b3e-48db-a762-97640a882c16/guluvopokipikud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf7d001-0c6b-4692-998d-0871375b8eb4/bose_wave_radio_model_awrc_1p_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4274290b-5f25-40d8-8084-2c7580d99938/85685560704.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_off0000c5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D2 5316 bytes
SHA-256: e622890872d8fd50ff6d6a0146bb70556730a47d6eddda529d04de3b288339b6
font_01_sfnt_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 10972 bytes
SHA-256: 4d6243848ac51c98bbf0de4d0045c77bbeb39ac7da2c73c5671cc8b7e6c9771a

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