Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8cd6fbd45522b8…

MALICIOUS

PDF

85.6 KB Created: 2020-12-06 06:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2c34e3a3e074650abd33ff0cb4c62510 SHA-1: 10ab52bd4c52afe346e6465fedb37eea3e15dca8 SHA-256: 8c8cd6fbd45522b884d6cef1f3e206c7e78e7ec5aeb6c397b382a02cfb1f63ab
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://trafffi.ru/strik?utm_term=nextbook+ares+8a+activation+code+bypass PDF link annotation
    • https://nefositasin.weebly.com/uploads/1/3/4/3/134310380/kimojuv.pdfIn PDF document text
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/zifal-gewexixugomi-nanejasaganefo-bugulalag.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/jepufubomalofi_kokojigof.pdfIn PDF document text
    • https://beripetalodewug.weebly.com/uploads/1/3/4/8/134865824/pirewepitepawoj.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/maputigog-pedavelewirak-gugakomadaxu.pdfIn PDF document text
    • https://murikupa.weebly.com/uploads/1/3/4/4/134481598/tonagep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5add9f9866f3fd2f487b8/t/5fcbfdd6e43f2b00a8931ed0/1607204313494/race_formula_nations_mod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5506ab8467722f1f11d37/t/5fc736fcefc65c5b7a3ee21d/1606891261673/strompreisvergleich_verivox_oder_check24.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955d4df5-2515-4cd8-b96c-6ad9e84d5ec5/rationalize_denominator_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f27ea13a450babf44921/t/5fc5bbbd08845d092451780f/1606794173841/bisabenupisoniwu.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/gazeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6314f8-38c9-4f14-877d-919b97d26bcf/71937401210.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf622718e72e5fdbcf9117/1606378025130/count_of_monte_cristo_character_relationships.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef818ce-e94d-472a-8ee8-4c00224c5cbd/63465601249.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_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 5632 bytes
SHA-256: 737a64ba91bc6346bb1d89d3e644439a23c5f535d7fb77b12ee17f998e9751c6
font_01_sfnt_off000126ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AC 10144 bytes
SHA-256: 048eee22d4aa82707551f7db51c45b12194f4dec62bbc30c8cdaae54a1aeac24

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