Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6ee0d4a72a3f54…

MALICIOUS

PDF

62.6 KB Created: 2020-11-26 05:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 899b38c89f21eaf6bfc2ad1158fbe5af SHA-1: de4c7dd62caba2ca26c68365ed49fa882364c22d SHA-256: 8b6ee0d4a72a3f54e21b77338882f0cff8646b46c7c73f3777be0872d7d92199
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffe.ru/strik?utm_term=convert+300+lb%252Fft3+to+kn%252Fm3 PDF link annotation
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdfIn PDF document text
    • https://xexonukomamub.weebly.com/uploads/1/3/4/3/134353621/zamuvexepelifa_tinaluxidowo_nexidadexij.pdfIn PDF document text
    • https://kizutinapetesod.weebly.com/uploads/1/3/4/4/134490845/wulelo.pdfIn PDF document text
    • https://vamoketuvet.weebly.com/uploads/1/3/3/9/133999376/rirupoxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/civil_war_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/intermediate_disturbance_hypothesis_simbio_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aec11f2-ceb0-4cb4-bf0d-c5ca023e54a0/7938698612.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/freckleface_strawberry_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7dc511-d0c7-44be-9132-8f5eb12549a0/lanumudoterubemalarol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da10120e-0b9a-41bd-9d7d-36d3f7e1eb5d/rofatisujuxifekus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7770df74-2f99-4324-8b24-73c6d9cade7a/89206554331.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/omron_bp791it_manual.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_off0000b6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F6 5036 bytes
SHA-256: 6485ca60caf0deaeb3f30ffe4b867a5bd1b4fc220933f8f65ec9334833adcd30
font_01_sfnt_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 10916 bytes
SHA-256: 277026f7c36e8a38ad185ec6fbbf7417312e69aa47d245211b94899e7e941bdc

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