Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa31031d5b3685bc…

MALICIOUS

PDF

66.6 KB Created: 2020-12-22 14:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a3b7cb46de1e079d4bc67479cc27cc3f SHA-1: b252a3fb7b61b5b3ba2f012eb3a9b8537a006ce4 SHA-256: aa31031d5b3685bc84a27c8aab8a4121b58c5cca1e0480047df137aeeb06c511
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or a mechanism for distributing further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/aws?utm_term=job+application+template+word+free PDF link annotation
    • https://sevanilab.weebly.com/uploads/1/3/1/4/131437268/tosapagoruxisojovi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393188/normal_5fc7c3d294587.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/mijedusovineti/gozisikuwuvukisavaserig.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/53437090792.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/excel_vlookup_reference_another_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/meal_plan_calendar_template_excel.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54596d49dd12447511b72/t/5fd720a0c4373837b923f7db/1607934112465/cronusmax_game_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/jevuxozazebazug/northland_family_planning_sterling_heights.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/browser_android_ringan_ram.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce2dc706af1e3f448c2ec4/t/5fd65c11154d727871ea8ff9/1607883794570/korum.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/futovegejugas.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_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 5344 bytes
SHA-256: acf715c6dbeb6346b1ebed01bf868382a0917fba9a6b2d565f5849f92e854514
font_01_sfnt_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 9684 bytes
SHA-256: d50feeca9ff50402df3df6cfc6a3cc168e2a3403612301ef0696ee7a9f985d97

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