Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9e4cae2e363076…

MALICIOUS

PDF

106.8 KB Created: 2021-01-08 13:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 90c8b68c63f77f3562a270f22a384681 SHA-1: 913ab74a262b9c3f436873d5feeb5fcdb2b75e2d SHA-256: 8c9e4cae2e363076b429b9119baed58fa1946e336ba124360f92d75c5e73cb57
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/aws?utm_term=conditional+operator+in+c+pdf PDF link annotation
    • https://wozavosasegug.weebly.com/uploads/1/3/4/5/134509229/6853225.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/fasidevawuwuze_lumimurifag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fd30e5833c2a.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/jibiro.pdfIn PDF document text
    • https://mutuvedaluvop.weebly.com/uploads/1/3/1/8/131856278/c0d7aa88e.pdfIn PDF document text
    • https://benesigonej.weebly.com/uploads/1/3/1/6/131607635/d3097eb3c9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f9271d82243f.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/5401885.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/muxegeza/27573590990.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/texans_injury_report_week_11.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/69701151288.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/jeladaxut.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/refarimofefawipujirix.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/email_introduction_template.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C91 4876 bytes
SHA-256: c0366d00f94e7f7a7c5e377d2e5523c9e2d91a2dc066f513e294b1b5c6f7e7d8
font_01_sfnt_off00014cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF4 6568 bytes
SHA-256: 11cca4188fc2499bf94f5d9fe27fb7b0091f4834c5e9efb0bb9d58ad7bd673dd
font_02_sfnt_off00015d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D36 12716 bytes
SHA-256: cc586d3b3127926718cdbbf1980558ae15aa66643996a6bedc61e8135caf26d4
font_03_sfnt_off00018818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18818 16176 bytes
SHA-256: 5d90560c7b16a89c369f6b414f5e51404dee0d7a94590232ca71669273d76027

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